Difference between revisions of "Select count"
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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. | + | The <code>COUNT(*)</code> function returns the number of rows returned by a <code>SELECT</code> statement, including <code>NULL</code> and duplicates. |
Revision as of 19:27, 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: 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
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