Category: SQL

The SQL EXCEPT operator is a set operator that is used to return the records that are present in the first table but not in the second table. This operator is very useful in situations where you need to compare two tables and find the records that are unique to one of them. Syntax The…(Continue Reading)

The SQL INTERSECT operator is used to retrieve the common records from two or more SELECT statements. The INTERSECT operator returns only those records that appear in all the SELECT statements specified in the query. Syntax The syntax for the SQL INTERSECT operator is as follows: SELECT column1, column2, … FROM table1 INTERSECT SELECT column1,…(Continue Reading)

The SQL UNION ALL operator combines the result sets of two or more SELECT statements into a single result set. It is similar to the UNION operator, but it does not remove duplicate rows from the result set. Syntax The syntax for using UNION ALL is similar to UNION, but with the addition of the…(Continue Reading)

SQL UNION operator allows users to combine the results of two or more SELECT statements into a single result set. The UNION operator returns only distinct values by default, making it a useful tool for merging multiple tables or queries while eliminating any duplicates. Syntax The syntax for using UNION in SQL is as follows:…(Continue Reading)

The SQL NOT EXISTS operator is used to check if a subquery returns no result. It is often used in combination with a correlated subquery, which is a subquery that depends on values from the outer query. Syntax The syntax for the NOT EXISTS operator is as follows: SELECT column_name(s) FROM table_name WHERE NOT EXISTS…(Continue Reading)

The SQL EXISTS operator is used to check whether a subquery returns any rows. It is commonly used in conjunction with a correlated subquery to perform conditional logic in SQL statements. Syntax The basic syntax of the EXISTS operator is as follows: SELECT column_name(s) FROM table_name WHERE EXISTS (subquery); In this syntax, the subquery is…(Continue Reading)

The SQL ALL operator is a comparison operator used to check whether all values in a subquery meet a specified condition. It returns a Boolean value of true if all values satisfy the condition and false if at least one value does not satisfy the condition. Syntax The syntax for using the ALL operator is…(Continue Reading)

The SQL ANY operator is a comparison operator used to compare a value with a set of values returned by a subquery. The ANY operator evaluates to true if the value being compared matches any of the values in the set. The operator can be used with various comparison operators such as =, >, =,…(Continue Reading)

The SQL IN operator allows you to specify a set of values to match against a column in a database table. It is commonly used in SQL queries to filter data based on a specific criteria. Syntax The syntax for the IN operator is simple. You simply specify the column you want to filter on,…(Continue Reading)

A subquery in SQL is a query that is nested within another query. It is used to retrieve data that will be used in the main query as a filter condition, or as a source of data for a calculation. The SQL subqueries are used to retrieve data that will be used as a condition…(Continue Reading)