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 <code>NULL</code> 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. | ||
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* <code>[[select count]](*) from [[pg_stat_activity]] where query like '[[autovacuum]]:%';</code> | * <code>[[select count]](*) from [[pg_stat_activity]] where query like '[[autovacuum]]:%';</code> | ||
| − | ==Related terms== | + | == Related terms == |
| − | *<code>[[Pg stat activity]]</code> | + | * <code>[[Pg stat activity]]</code> |
| − | + | * <code>[[select distinct]]</code> | |
== See also == | == See also == | ||
Latest revision as of 13:47, 8 November 2022
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:%';
Related terms[edit]
See also[edit]
- 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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