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Oracle EXISTS

Oracle EXISTS for beginners and professionals with examples on insert, select, update, delete, table, view, join, key, functions, procedures, indexes, cursor etc.

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ORACLE EXISTS

In Oracle, exists clause is used with select, insert, update, delete statements. It is used to combine the queries and creating subquery.

Syntax

Where exists (subquery)

Parameters

subquery: It is a select statement which returns at least one record set.

Table 1:

ORACLE EXISTS

Table 1:

ORACLE EXISTS

Example 1

Query: select name from table1 where exists (select *from table2 where table1.id=table2.id)

ORACLE EXISTS

Example 2

Query: select id, salary from table2 where exists (select *from table1 where table2.id=table1.id)

ORACLE EXISTS

Example 3

Query: select * from table1 where not exists (select *from table2 where table1.id=table2.id)

ORACLE EXISTS
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