A one-to-one relationship means one record in a table is associated with only one record in another…
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CROSS APPLY is used to join a table with a table-valued function or a derived table. It…
A CROSS JOIN returns the Cartesian product of two tables. That means every row from the first…
A SELF JOIN is a join where a table is joined with itself. Useful for comparing rows…
A FULL OUTER JOIN returns all rows from both tables. If there is a match, it shows…
A RIGHT JOIN (or RIGHT OUTER JOIN) returns all rows from the right table and the matching…
A LEFT JOIN (or LEFT OUTER JOIN) returns all rows from the left table and the matching…
An INNER JOIN returns only the rows that have matching values in both tables. Non-matching rows from…
A JOIN is used to combine rows from two or more tables based on a related column…
An alias is a temporary name given to a table or column in a SQL query. Aliases…
The LIKE operator is used in a WHERE clause to search for a specific pattern in a…
The BETWEEN operator is used in a WHERE clause to filter values within a range. Basic syntax:…
The IN operator is used in a WHERE clause to check if a value matches any value…
The OR operator is used in a WHERE clause to combine two or more conditions. A row…
The AND operator is used in a WHERE clause to combine two or more conditions. All conditions…
In SQL Server: NULL represents missing, unknown, or undefined data. NULL is not the same as 0…
Step 1: Understanding WHERE The WHERE clause is used to filter records in a SELECT, UPDATE, or…
Step 1: Understanding SELECT DISTINCT The DISTINCT keyword is used in a SELECT statement to remove duplicate…