SQL-Coding-Practices-Solutions

Here are some SQL coding solution that will help for preparation and also helpful for beginners.

SQL BAsics commands are:

1. CREATE DATABASE: Used to create a new database.
2. USE DATABASE: Select a specific database to work with.
3. CREATE TABLE: Create a new table within a database.
4. ALTER TABLE: Modify the structure of an existing table, such as adding, modifying, or deleting columns.
5. INSERT INTO: Add new records (rows) into a table.
6. SELECT: Retrieve data from one or more tables. You can use various clauses with SELECT, such as WHERE for filtering, ORDER BY for sorting, and JOIN for combining data from multiple tables.
7. UPDATE: Modify existing records in a table.
8. DELETE: Remove records from a table.
9. DROP TABLE: Delete an entire table and its data.
10. TRUNCATE TABLE: Remove all records from a table, but keep the table structure.
11. CREATE INDEX: Create an index on one or more columns for faster data retrieval.
12. DROP INDEX: Delete an existing index.
13. ALTER USER: Modify user account settings, including privileges and passwords.
14. GRANT: Provide specific privileges or permissions to a user or role.
15. REVOKE: Remove specific privileges or permissions from a user or role.
16. BEGIN TRANSACTION, COMMIT, ROLLBACK: Manage transactions to ensure data consistency and integrity.
17. CREATE VIEW: Create a virtual table that is based on the result of a SELECT query.
18. JOIN: Combine data from multiple tables based on a related column or condition.
19. GROUP BY: Group rows together based on the values in one or more columns, often used with aggregate functions like SUM, COUNT, AVG, etc.
20. ORDER BY: Sort the result set in ascending or descending order based on one or more columns.
21. LIMIT or TOP: Restrict the number of rows returned in a query result.
22. UNION, INTERSECT, EXCEPT: Combine or compare the result sets of two or more SELECT queries.
23. CREATE PROCEDURE and CREATE FUNCTION: Define stored procedures and functions for reusability and modularity.
24. CALL or EXECUTE: Invoke a stored procedure or function.
25. CREATE TRIGGER: Define triggers that automatically execute in response to certain database events.
26. SHOW DATABASES, SHOW TABLES: Retrieve information about the available databases and tables.
27. DESCRIBE or SHOW COLUMNS: Display information about the columns in a table.