What is the difference between in and exists in mysql

Compound Statement Syntax. Variables in Stored Programs. Local Variable Scope and Resolution. Flow Control Statements. Restrictions on Server-Side Cursors.

Restrictions on Condition Handling. Database Administration Statements. Account Management Statements. Resource Group Management Statements.

Table Maintenance Statements. Component, Plugin, and Loadable Function Statements. Other Administrative Statements. In IN clause, first sub query runs and the output is used as input for outer query. In Exists clause, first the main query runs and take one row and check it in the sub query as input for the sub query in where clause. Related questions. What is the difference between delete and truncate in SQL?

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All categories Python 3. But with IN sub query is not using this index so execution time is same. Our sub query will return null. The Exists keyword evaluates true or false, but IN keyword compare all value in the corresponding sub query column. In our case IN query will give syntax error. But Exist give empty results. Exists is more faster then IN. Always use Exists whenever sub query result is large or null. With IN.