Update README.md

Author: Prerna-Chachare

README.md

@@ -1,6 +1,6 @@
 # Sql Notes And Cheatsheet 
 
-## Coding Standreds
+## Coding Standards
 1. Use [ ] brackets to specify coloumn name in select statement.
 2. Do not use SELECT * as it affects significant performance.
    For. Eg. SELECT **[ID]**
@@ -20,3 +20,19 @@
                  **,** [NAME]
                  **,** [SALARY]
                  from Employees;
+6. Execution of query should be fast so write query likewise.
+7. Proper Indentation should be followed while writing the query.
+8. Define Aliases to change column name to your convenient name. Used to shorten Column Names of Coulmns having large names.
+9. **'AS'** keyword is used to define aliases.
+   For. Eg. SELECT **[Department Name]** AS **[DeptName]**
+                   from Employees;
+10. First Character of Identifier should start with **(_), (@), #**.
+11. Do not use Reserved keywords for identifiers.
+12. Not to use embedded special or supplementary characters.
+13. When keyword & column name are same use square bracket to use column name in query.
+    For. Eg. SELECT [NAME]
+                   , **[DATE]** 
+                   from Employees;
+14. Temporary Table can be created using #, ## or Table Variable.
+15. **;** should be specified at the termination of every statement.
+16. **;** always required for Common Table Expressions and Service Broker Commands.