diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3dcec4d0..6a6418d9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -4,7 +4,7 @@ Contributions are very welcome! We'll be happy to help you in the process.
 
 ## What should I know before I get started?
 
-Go through the README and the documentation, and make sure that you understand how data-diff works. 
+Go through the README and the documentation, and make sure that you understand how data-diff works.
 
 ## How to contribute?
 
@@ -13,12 +13,12 @@ Go through the README and the documentation, and make sure that you understand h
 Please report the bug with as many details as you can.
 
 1. Include the exact command that you used. Make sure to run data-diff with the `-d` flag for debug output.
-2. Provide the entire output of the command. (stdout, logs, exception) 
+2. Provide the entire output of the command. (stdout, logs, exception)
 3. If possible, show us how we could reproduce the bug. i.e. how to set up an environment in which it occurs.
 
 (When pasting, always make sure to redact sensitive information, like passwords.)
 
-If data-diff returns incorrect results, i.e. false-positive or false-negative, please also include the original values.  
+If data-diff returns incorrect results, i.e. false-positive or false-negative, please also include the original values.
 
 Before you report a bug, make sure it doesn't already exist.
 
@@ -66,7 +66,7 @@ Make sure to update the appropriate `TEST_*_CONN_STRING`, so that it will be inc
 
 You can run the tests with `unittest`.
 
-When running against multiple databases, the tests can take a long while. 
+When running against multiple databases, the tests can take a long while.
 
 To save time, we recommend running them with `unittest-parallel`.
 
@@ -76,6 +76,6 @@ When debugging, we recommend using the `-f` flag, to stop on error. Also, use th
 
 New databases should be added as a new module in the `data-diff/databases/` folder.
 
-Make sure to update the `DATABASE_TYPES` dictionary in `tests/test_database_types.py`, so that it will be included in the tests.
-
 If possible, please also add the database setup to `docker-compose.yml`, so that we can run and test it for ourselves. If you do, also update the CI (`ci.yml`).
+
+Guide to implementing a new database driver: https://data-diff.readthedocs.io/en/latest/new-database-driver-guide.html
diff --git a/data_diff/diff_tables.py b/data_diff/diff_tables.py
index dc6d91ae..5efee0c7 100644
--- a/data_diff/diff_tables.py
+++ b/data_diff/diff_tables.py
@@ -231,13 +231,14 @@ def _bisect_and_diff_tables(
     ):
         assert table1.is_bounded and table2.is_bounded
 
+        max_space_size = max(table1.approximate_size(), table2.approximate_size())
         if max_rows is None:
-            # We can be sure that row_count <= max_rows
-            max_rows = max(table1.approximate_size(), table2.approximate_size())
+            # We can be sure that row_count <= max_rows iff the table key is unique
+            max_rows = max_space_size
 
         # If count is below the threshold, just download and compare the columns locally
         # This saves time, as bisection speed is limited by ping and query performance.
-        if max_rows < self.bisection_threshold:
+        if max_rows < self.bisection_threshold or max_space_size < self.bisection_factor * 2:
             rows1, rows2 = self._threaded_call("get_values", [table1, table2])
             diff = list(diff_sets(rows1, rows2))
 
@@ -255,7 +256,8 @@ def _bisect_and_diff_tables(
             return diff
 
         # Choose evenly spaced checkpoints (according to min_key and max_key)
-        checkpoints = table1.choose_checkpoints(self.bisection_factor - 1)
+        biggest_table = max(table1, table2, key=methodcaller('approximate_size'))
+        checkpoints = biggest_table.choose_checkpoints(self.bisection_factor - 1)
 
         # Create new instances of TableSegment between each checkpoint
         segmented1 = table1.segment_by_checkpoints(checkpoints)
diff --git a/poetry.lock b/poetry.lock
index 1fb39b76..51ad249e 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -31,7 +31,7 @@ tzdata = ["tzdata"]
 
 [[package]]
 name = "certifi"
-version = "2022.6.15.1"
+version = "2022.9.24"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "main"
 optional = false
@@ -109,7 +109,7 @@ test = ["flake8 (==3.7.8)", "hypothesis (==3.55.3)"]
 
 [[package]]
 name = "coverage"
-version = "6.4.4"
+version = "6.5.0"
 description = "Code coverage measurement for Python"
 category = "dev"
 optional = false
@@ -159,7 +159,7 @@ testing = ["covdefaults (>=2.2)", "coverage (>=6.4.2)", "pytest (>=7.1.2)", "pyt
 
 [[package]]
 name = "idna"
-version = "3.3"
+version = "3.4"
 description = "Internationalized Domain Names in Applications (IDNA)"
 category = "main"
 optional = false
@@ -167,7 +167,7 @@ python-versions = ">=3.5"
 
 [[package]]
 name = "importlib-metadata"
-version = "4.12.0"
+version = "5.0.0"
 description = "Read metadata from Python packages"
 category = "main"
 optional = false
@@ -178,9 +178,9 @@ typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["jaraco.packaging (>=9)", "rst.linker (>=1.9)", "sphinx"]
+docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)"]
 perf = ["ipython"]
-testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf (>=0.9.2)"]
+testing = ["flake8 (<5)", "flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf (>=0.9.2)"]
 
 [[package]]
 name = "lark-parser"
@@ -257,7 +257,7 @@ server = ["starlette"]
 
 [[package]]
 name = "presto-python-client"
-version = "0.8.2"
+version = "0.8.3"
 description = "Client for the Presto distributed SQL Engine"
 category = "main"
 optional = false
@@ -295,7 +295,7 @@ python-versions = ">=3.7"
 
 [[package]]
 name = "psycopg2"
-version = "2.9.3"
+version = "2.9.4"
 description = "psycopg2 - Python-PostgreSQL Database Adapter"
 category = "main"
 optional = false
@@ -330,16 +330,16 @@ plugins = ["importlib-metadata"]
 
 [[package]]
 name = "PyJWT"
-version = "2.4.0"
+version = "2.5.0"
 description = "JSON Web Token implementation in Python"
 category = "main"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 
 [package.extras]
-crypto = ["cryptography (>=3.3.1)"]
-dev = ["coverage[toml] (==5.0.4)", "cryptography (>=3.3.1)", "mypy", "pre-commit", "pytest (>=6.0.0,<7.0.0)", "sphinx", "sphinx-rtd-theme", "zope.interface"]
-docs = ["sphinx", "sphinx-rtd-theme", "zope.interface"]
+crypto = ["cryptography (>=3.3.1)", "types-cryptography (>=3.3.21)"]
+dev = ["coverage[toml] (==5.0.4)", "cryptography (>=3.3.1)", "pre-commit", "pytest (>=6.0.0,<7.0.0)", "sphinx (>=4.5.0,<5.0.0)", "sphinx-rtd-theme", "types-cryptography (>=3.3.21)", "zope.interface"]
+docs = ["sphinx (>=4.5.0,<5.0.0)", "sphinx-rtd-theme", "zope.interface"]
 tests = ["coverage[toml] (==5.0.4)", "pytest (>=6.0.0,<7.0.0)"]
 
 [[package]]
@@ -370,7 +370,7 @@ six = ">=1.5"
 
 [[package]]
 name = "pytz"
-version = "2022.2.1"
+version = "2022.4"
 description = "World timezone definitions, modern and historical"
 category = "main"
 optional = false
@@ -408,7 +408,7 @@ use_chardet_on_py3 = ["chardet (>=3.0.2,<6)"]
 
 [[package]]
 name = "rich"
-version = "12.5.1"
+version = "12.6.0"
 description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
 category = "main"
 optional = false
@@ -432,14 +432,14 @@ python-versions = ">=3.6,<4.0"
 
 [[package]]
 name = "setuptools"
-version = "65.3.0"
+version = "65.4.1"
 description = "Easily download, build, install, upgrade, and uninstall Python packages"
 category = "main"
 optional = false
 python-versions = ">=3.7"
 
 [package.extras]
-docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "pygments-github-lexers (==0.0.5)", "rst.linker (>=1.9)", "sphinx", "sphinx-favicon", "sphinx-hoverxref (<2)", "sphinx-inline-tabs", "sphinx-notfound-page (==0.8.3)", "sphinx-reredirects", "sphinxcontrib-towncrier"]
+docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "pygments-github-lexers (==0.0.5)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-favicon", "sphinx-hoverxref (<2)", "sphinx-inline-tabs", "sphinx-notfound-page (==0.8.3)", "sphinx-reredirects", "sphinxcontrib-towncrier"]
 testing = ["build[virtualenv]", "filelock (>=3.4.0)", "flake8 (<5)", "flake8-2020", "ini2toml[lite] (>=0.9)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "mock", "pip (>=19.1)", "pip-run (>=8.8)", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf", "pytest-xdist", "tomli-w (>=1.0.0)", "virtualenv (>=13.0.0)", "wheel"]
 testing-integration = ["build[virtualenv]", "filelock (>=3.4.0)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pytest", "pytest-enabler", "pytest-xdist", "tomli", "virtualenv (>=13.0.0)", "wheel"]
 
@@ -453,7 +453,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "snowflake-connector-python"
-version = "2.7.12"
+version = "2.8.0"
 description = "Snowflake Connector for Python"
 category = "main"
 optional = false
@@ -511,7 +511,7 @@ tests = ["click", "httpretty (<1.1)", "pytest", "pytest-runner", "requests-kerbe
 
 [[package]]
 name = "typing-extensions"
-version = "4.3.0"
+version = "4.4.0"
 description = "Backported and Experimental Type Hints for Python 3.7+"
 category = "main"
 optional = false
@@ -519,7 +519,7 @@ python-versions = ">=3.7"
 
 [[package]]
 name = "tzdata"
-version = "2022.2"
+version = "2022.4"
 description = "Provider of IANA time zone data"
 category = "main"
 optional = false
@@ -588,15 +588,15 @@ python-versions = "*"
 
 [[package]]
 name = "zipp"
-version = "3.8.1"
+version = "3.9.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
 category = "main"
 optional = false
 python-versions = ">=3.7"
 
 [package.extras]
-docs = ["jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx"]
-testing = ["func-timeout", "jaraco.itertools", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)"]
+docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)"]
+testing = ["flake8 (<5)", "func-timeout", "jaraco.functools", "jaraco.itertools", "more-itertools", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)"]
 
 [extras]
 clickhouse = ["clickhouse-driver"]
@@ -642,8 +642,8 @@ asn1crypto = [
     {file = "backports.zoneinfo-0.2.1.tar.gz", hash = "sha256:fadbfe37f74051d024037f223b8e001611eac868b5c5b06144ef4d8b799862f2"},
 ]
 certifi = [
-    {file = "certifi-2022.6.15.1-py3-none-any.whl", hash = "sha256:43dadad18a7f168740e66944e4fa82c6611848ff9056ad910f8f7a3e46ab89e0"},
-    {file = "certifi-2022.6.15.1.tar.gz", hash = "sha256:cffdcd380919da6137f76633531a5817e3a9f268575c128249fb637e4f9e73fb"},
+    {file = "certifi-2022.9.24-py3-none-any.whl", hash = "sha256:90c1a32f1d68f940488354e36370f6cca89f0f106db09518524c88d6ed83f382"},
+    {file = "certifi-2022.9.24.tar.gz", hash = "sha256:0d9c601124e5a6ba9712dbc60d9c53c21e34f5f641fe83002317394311bdce14"},
 ]
 cffi = [
     {file = "cffi-1.15.1-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:a66d3508133af6e8548451b25058d5812812ec3798c886bf38ed24a98216fab2"},
@@ -801,56 +801,56 @@ commonmark = [
     {file = "commonmark-0.9.1.tar.gz", hash = "sha256:452f9dc859be7f06631ddcb328b6919c67984aca654e5fefb3914d54691aed60"},
 ]
 coverage = [
-    {file = "coverage-6.4.4-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:e7b4da9bafad21ea45a714d3ea6f3e1679099e420c8741c74905b92ee9bfa7cc"},
-    {file = "coverage-6.4.4-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:fde17bc42e0716c94bf19d92e4c9f5a00c5feb401f5bc01101fdf2a8b7cacf60"},
-    {file = "coverage-6.4.4-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:cdbb0d89923c80dbd435b9cf8bba0ff55585a3cdb28cbec65f376c041472c60d"},
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+    {file = "psycopg2-2.9.4-cp36-cp36m-win_amd64.whl", hash = "sha256:46361c054df612c3cc813fdb343733d56543fb93565cff0f8ace422e4da06acb"},
+    {file = "psycopg2-2.9.4-cp37-cp37m-win32.whl", hash = "sha256:aafa96f2da0071d6dd0cbb7633406d99f414b40ab0f918c9d9af7df928a1accb"},
+    {file = "psycopg2-2.9.4-cp37-cp37m-win_amd64.whl", hash = "sha256:aa184d551a767ad25df3b8d22a0a62ef2962e0e374c04f6cbd1204947f540d61"},
+    {file = "psycopg2-2.9.4-cp38-cp38-win32.whl", hash = "sha256:839f9ea8f6098e39966d97fcb8d08548fbc57c523a1e27a1f0609addf40f777c"},
+    {file = "psycopg2-2.9.4-cp38-cp38-win_amd64.whl", hash = "sha256:c7fa041b4acb913f6968fce10169105af5200f296028251d817ab37847c30184"},
+    {file = "psycopg2-2.9.4-cp39-cp39-win32.whl", hash = "sha256:07b90a24d5056687781ddaef0ea172fd951f2f7293f6ffdd03d4f5077801f426"},
+    {file = "psycopg2-2.9.4-cp39-cp39-win_amd64.whl", hash = "sha256:849bd868ae3369932127f0771c08d1109b254f08d48dc42493c3d1b87cb2d308"},
+    {file = "psycopg2-2.9.4.tar.gz", hash = "sha256:d529926254e093a1b669f692a3aa50069bc71faf5b0ecd91686a78f62767d52f"},
 ]
 pycparser = [
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@@ -1015,8 +1015,8 @@ Pygments = [
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 ]
 PyJWT = [
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-    {file = "PyJWT-2.4.0.tar.gz", hash = "sha256:d42908208c699b3b973cbeb01a969ba6a96c821eefb1c5bfe4c390c01d67abba"},
+    {file = "PyJWT-2.5.0-py3-none-any.whl", hash = "sha256:8d82e7087868e94dd8d7d418e5088ce64f7daab4b36db654cbaedb46f9d1ca80"},
+    {file = "PyJWT-2.5.0.tar.gz", hash = "sha256:e77ab89480905d86998442ac5788f35333fa85f65047a534adc38edf3c88fc3b"},
 ]
 pyOpenSSL = [
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@@ -1027,8 +1027,8 @@ python-dateutil = [
     {file = "python_dateutil-2.8.2-py2.py3-none-any.whl", hash = "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"},
 ]
 pytz = [
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-    {file = "pytz-2022.2.1.tar.gz", hash = "sha256:cea221417204f2d1a2aa03ddae3e867921971d0d76f14d87abb4414415bbdcf5"},
+    {file = "pytz-2022.4-py2.py3-none-any.whl", hash = "sha256:2c0784747071402c6e99f0bafdb7da0fa22645f06554c7ae06bf6358897e9c91"},
+    {file = "pytz-2022.4.tar.gz", hash = "sha256:48ce799d83b6f8aab2020e369b627446696619e79645419610b9facd909b3174"},
 ]
 pytz-deprecation-shim = [
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@@ -1039,42 +1039,42 @@ requests = [
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 ]
 rich = [
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-    {file = "rich-12.5.1.tar.gz", hash = "sha256:63a5c5ce3673d3d5fbbf23cd87e11ab84b6b451436f1b7f19ec54b6bc36ed7ca"},
+    {file = "rich-12.6.0-py3-none-any.whl", hash = "sha256:a4eb26484f2c82589bd9a17c73d32a010b1e29d89f1604cd9bf3a2097b81bb5e"},
+    {file = "rich-12.6.0.tar.gz", hash = "sha256:ba3a3775974105c221d31141f2c116f4fd65c5ceb0698657a11e9f295ec93fd0"},
 ]
 runtype = [
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     {file = "runtype-0.2.7.tar.gz", hash = "sha256:5a9e1212846b3e54d4ba29fd7db602af5544a2a4253d1f8d829087214a8766ad"},
 ]
 setuptools = [
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-    {file = "setuptools-65.3.0.tar.gz", hash = "sha256:7732871f4f7fa58fb6bdcaeadb0161b2bd046c85905dbaa066bdcbcc81953b57"},
+    {file = "setuptools-65.4.1-py3-none-any.whl", hash = "sha256:1b6bdc6161661409c5f21508763dc63ab20a9ac2f8ba20029aaaa7fdb9118012"},
+    {file = "setuptools-65.4.1.tar.gz", hash = "sha256:3050e338e5871e70c72983072fe34f6032ae1cdeeeb67338199c2f74e083a80e"},
 ]
 six = [
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     {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
 ]
 snowflake-connector-python = [
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-    {file = "snowflake_connector_python-2.7.12-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:ad8e2680b0ac902443de001ed1ced7c1b01fee32d98a94fa56592684ffdfadb2"},
-    {file = "snowflake_connector_python-2.7.12-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:5623f5b2bc3a170b8c65d2a10f158741f65a9f43cc22958510c767f85376da1e"},
-    {file = "snowflake_connector_python-2.7.12-cp310-cp310-win_amd64.whl", hash = "sha256:775593002415c6817fa949870a9feb6812a36f88e8d35663c84b4cbf9875d165"},
-    {file = "snowflake_connector_python-2.7.12-cp37-cp37m-macosx_10_14_x86_64.whl", hash = "sha256:9a70b119c8b1a4775b8870d5b8db46631f56380efbfcc37cec4d80a18f72dc06"},
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-    {file = "snowflake_connector_python-2.7.12-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:24a3963a8d7c99ca120b329046b52f6ebf1ada9a7778edb00c52859f7089ac12"},
-    {file = "snowflake_connector_python-2.7.12-cp37-cp37m-win_amd64.whl", hash = "sha256:f63d990c36a86beb07206cfb99cd81b3934dba0ef80d9c5e343bff9f00357cb9"},
-    {file = "snowflake_connector_python-2.7.12-cp38-cp38-macosx_10_14_x86_64.whl", hash = "sha256:1242b79311bf9932825a46e1a8e455bd06a4487c61fc57c68a3626a9ddfa6273"},
-    {file = "snowflake_connector_python-2.7.12-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:764aef9c6feae2eb0afeda45810bc2ba096a1e30c1a6b5bbf4f0129d7df0b65a"},
-    {file = "snowflake_connector_python-2.7.12-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:7756945ddd968e24fc3baa5f731618dadfa566964063c860b8c33dbeffea4ed1"},
-    {file = "snowflake_connector_python-2.7.12-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:0daf777bbd0fdeddfb131610289662f2a72688dd5072db4bc346a9ff5fe68774"},
-    {file = "snowflake_connector_python-2.7.12-cp38-cp38-win_amd64.whl", hash = "sha256:1372b8032ddde0096cb9e55c2e809863ba45eb69aef3b5b7eb14d51a36970ac6"},
-    {file = "snowflake_connector_python-2.7.12-cp39-cp39-macosx_10_14_universal2.whl", hash = "sha256:10a287b18b1b8b6fb352f780d2727a1e9293cc86985a9f5816e0823d280bcf94"},
-    {file = "snowflake_connector_python-2.7.12-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:bd58d6d5d63dda7e1111daaea4b4ce252dbea07dd03282a6b270433c1f048d94"},
-    {file = "snowflake_connector_python-2.7.12-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:35cd36392e14c18d80977925addf5c26edcc33631ea2bbb1db43dc64c64d27c9"},
-    {file = "snowflake_connector_python-2.7.12-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:2d5071eb8bca51b2dd1b8c2dfed395f10bb0ec3509a49ebcf65a9c25b39fd351"},
-    {file = "snowflake_connector_python-2.7.12-cp39-cp39-win_amd64.whl", hash = "sha256:77342d9c3fb4642949737cf78e041b858eb7811e5eb41cdedc5690e8739bf327"},
+    {file = "snowflake-connector-python-2.8.0.tar.gz", hash = "sha256:82f67e36e7fe36cd57218a6c04775e83303db231714fdf909ba91bb0947c24b6"},
+    {file = "snowflake_connector_python-2.8.0-cp310-cp310-macosx_10_14_universal2.whl", hash = "sha256:0603b7301b8b8bc9746a31271f2505f554ae56539eff3e6a5df77bea5ba92ebe"},
+    {file = "snowflake_connector_python-2.8.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:67bf20accc7df605f79f0c3b4819ce9a59405ff3c150099a1d19809a5ad3401e"},
+    {file = "snowflake_connector_python-2.8.0-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:4f463d28d814c5f447a856c2d0918f6fb4ebc715d9b9cfc926f4910328e6467d"},
+    {file = "snowflake_connector_python-2.8.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:c3a547c57e89b12e16218b13c1495505255bdd9c33d1b19aa4e93210a812b04a"},
+    {file = "snowflake_connector_python-2.8.0-cp310-cp310-win_amd64.whl", hash = "sha256:fc6105ae3de26a810fa8fd86652cef27586ab04715188a5a02b327199f26f159"},
+    {file = "snowflake_connector_python-2.8.0-cp37-cp37m-macosx_10_14_x86_64.whl", hash = "sha256:04d4bcbf64c9ae6bc2d094045d1be88383fe254180f4f1a8f939d6b4e08caa19"},
+    {file = "snowflake_connector_python-2.8.0-cp37-cp37m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:456b442f6a7e6e2f189739cbdd762c5a356eb77aeb917b4e551e59c8bbf564b5"},
+    {file = "snowflake_connector_python-2.8.0-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:ba9b247ff8938df621662fb4daa707f18645b561dc613acbf73dc9df99da4d51"},
+    {file = "snowflake_connector_python-2.8.0-cp37-cp37m-win_amd64.whl", hash = "sha256:843ca1505e9939e64f2d18d7f6fc19777623f322e1e3761cb7ac434f3333efdd"},
+    {file = "snowflake_connector_python-2.8.0-cp38-cp38-macosx_10_14_x86_64.whl", hash = "sha256:76792c0e5b05e031112dd6403a5570d9de754c5af3d13689213bdf3df51e8a03"},
+    {file = "snowflake_connector_python-2.8.0-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:befc0d53fe9bf5673c2f3d9f6e17f0069d76990f75c18560c3d71c6a51e5dc0f"},
+    {file = "snowflake_connector_python-2.8.0-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:ddb7d03e64b412647330600859d56dc9c95e8a0bf96353cb5ad675c52344d3e5"},
+    {file = "snowflake_connector_python-2.8.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:fb951351a978cebb066b6d55e3663d95fda0df7ea812fd29282ece1a36bc9c39"},
+    {file = "snowflake_connector_python-2.8.0-cp38-cp38-win_amd64.whl", hash = "sha256:2dca7e73bde387717f65ad33d3f8d80fbcf34809658ab2282c4eb82ca07204e1"},
+    {file = "snowflake_connector_python-2.8.0-cp39-cp39-macosx_10_14_universal2.whl", hash = "sha256:4eb54a2654c173ac5608fe90659195ae048c661cf6071c1edf6ea3f2117d14ba"},
+    {file = "snowflake_connector_python-2.8.0-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:793b260bb3a6cfd799b1b5273f81584ea3094f8138c3abac36de19e892b30018"},
+    {file = "snowflake_connector_python-2.8.0-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:8699b8761d40873a08f983cfc0a2c581ae3e11a74c0e780968f9b1c564335cb3"},
+    {file = "snowflake_connector_python-2.8.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:7eec3e5e1ea161c4164726cc86dd2435a820111420e30895d95d455878fcf64d"},
+    {file = "snowflake_connector_python-2.8.0-cp39-cp39-win_amd64.whl", hash = "sha256:c9aa4133b4babdc0f800411eef298721b4476af5a5068e23f048c6f08ea1b150"},
 ]
 toml = [
     {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
@@ -1085,12 +1085,12 @@ trino = [
     {file = "trino-0.314.0.tar.gz", hash = "sha256:433174f2f1b2e079cf64c00673e8a5a5b32c012891c0a6cfd44afa293ca74467"},
 ]
 typing-extensions = [
-    {file = "typing_extensions-4.3.0-py3-none-any.whl", hash = "sha256:25642c956049920a5aa49edcdd6ab1e06d7e5d467fc00e0506c44ac86fbfca02"},
-    {file = "typing_extensions-4.3.0.tar.gz", hash = "sha256:e6d2677a32f47fc7eb2795db1dd15c1f34eff616bcaf2cfb5e997f854fa1c4a6"},
+    {file = "typing_extensions-4.4.0-py3-none-any.whl", hash = "sha256:16fa4864408f655d35ec496218b85f79b3437c829e93320c7c9215ccfd92489e"},
+    {file = "typing_extensions-4.4.0.tar.gz", hash = "sha256:1511434bb92bf8dd198c12b1cc812e800d4181cfcb867674e0f8279cc93087aa"},
 ]
 tzdata = [
-    {file = "tzdata-2022.2-py2.py3-none-any.whl", hash = "sha256:c3119520447d68ef3eb8187a55a4f44fa455f30eb1b4238fa5691ba094f2b05b"},
-    {file = "tzdata-2022.2.tar.gz", hash = "sha256:21f4f0d7241572efa7f7a4fdabb052e61b55dc48274e6842697ccdf5253e5451"},
+    {file = "tzdata-2022.4-py2.py3-none-any.whl", hash = "sha256:74da81ecf2b3887c94e53fc1d466d4362aaf8b26fc87cda18f22004544694583"},
+    {file = "tzdata-2022.4.tar.gz", hash = "sha256:ada9133fbd561e6ec3d1674d3fba50251636e918aa97bd59d63735bef5a513bb"},
 ]
 tzlocal = [
     {file = "tzlocal-4.2-py3-none-any.whl", hash = "sha256:89885494684c929d9191c57aa27502afc87a579be5cdd3225c77c463ea043745"},
@@ -1112,6 +1112,6 @@ wcwidth = [
     {file = "wcwidth-0.2.5.tar.gz", hash = "sha256:c4d647b99872929fdb7bdcaa4fbe7f01413ed3d98077df798530e5b04f116c83"},
 ]
 zipp = [
-    {file = "zipp-3.8.1-py3-none-any.whl", hash = "sha256:47c40d7fe183a6f21403a199b3e4192cca5774656965b0a4988ad2f8feb5f009"},
-    {file = "zipp-3.8.1.tar.gz", hash = "sha256:05b45f1ee8f807d0cc928485ca40a07cb491cf092ff587c0df9cb1fd154848d2"},
+    {file = "zipp-3.9.0-py3-none-any.whl", hash = "sha256:972cfa31bc2fedd3fa838a51e9bc7e64b7fb725a8c00e7431554311f180e9980"},
+    {file = "zipp-3.9.0.tar.gz", hash = "sha256:3a7af91c3db40ec72dd9d154ae18e008c69efe8ca88dde4f9a731bb82fe2f9eb"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 9a72f172..386dba0d 100755
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "data-diff"
-version = "0.2.7"
+version = "0.2.8"
 description = "Command-line tool and Python library to efficiently diff rows across two different databases."
 authors = ["Datafold <data-diff@datafold.com>"]
 license = "MIT"
diff --git a/tests/test_diff_tables.py b/tests/test_diff_tables.py
index de0cde5d..a234833b 100644
--- a/tests/test_diff_tables.py
+++ b/tests/test_diff_tables.py
@@ -513,6 +513,9 @@ def setUp(self):
         ]
         for i in range(0, 10000, 1000):
             a = ArithAlphanumeric(numberToAlphanum(i), max_len=10)
+            if not a and isinstance(self.connection, db.Oracle):
+                # Skip empty string, because Oracle treats it as NULL ..
+                continue
             queries.append(f"INSERT INTO {self.table_src} VALUES ('{a}', '{i}')")
 
         queries += [
@@ -561,6 +564,9 @@ def setUp(self):
         ]
         for i in range(0, 10000, 1000):
             a = ArithAlphanumeric(numberToAlphanum(i * i))
+            if not a and isinstance(self.connection, db.Oracle):
+                # Skip empty string, because Oracle treats it as NULL ..
+                continue
             queries.append(f"INSERT INTO {self.table_src} VALUES ('{a}', '{i}')")
 
         queries += [