Difference between revisions of "Select count"
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(Created page with " * <code>select count(*) from pg_stat_activity where query like 'autovacuum:%';</code> == See also == * {{SQL}}") |
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| − | + | The <code>COUNT(*)</code> function returns the number of rows returned by a <code>SELECT</code> statement, including NULL and duplicates. | |
Revision as of 19:18, 5 August 2021
The COUNT(*) function returns the number of rows returned by a SELECT statement, including NULL and duplicates.
select count(*) from pg_stat_activity where query like 'autovacuum:%';
See also
- SQL, NewSQL, RDMS: GraphQL (2015), SQLite,
select, insert,select count, Distributed SQL, TablePlus, Cache hit ratio,pg_stat_user_tables,EXPLAIN, Index (PostgreSQL), DDL, SQL/MED, Group by, List users, SQL Injection, SQLAlchemy,CREATE USER, CREATE ROLE, EXPLAIN, ALTER DATABASE, REVOKE, NOLOCK, NOWAIT, EXISTS, Unique constraint,.sql
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