CREATE STATISTICS CREATE STATISTICS 7 SQL - Language Statements CREATE STATISTICS define extended statistics CREATE STATISTICS [ IF NOT EXISTS ] statistics_name ON ( column_name, column_name [, ...]) FROM table_name CREATE STATISTICS will create a new extended statistics object on the specified table. The statistics will be created in the current database and will be owned by the user issuing the command. If a schema name is given (for example, CREATE STATISTICS myschema.mystat ...) then the statistics is created in the specified schema. Otherwise it is created in the current schema. The name of the statistics must be distinct from the name of any other statistics in the same schema. IF NOT EXISTS Do not throw an error if a statistics with the same name already exists. A notice is issued in this case. Note that only the name of the statistics object is considered here. The definition of the statistics is not considered. statistics_name The name (optionally schema-qualified) of the statistics to be created. column_name The name of a column to be included in the statistics. table_name The name (optionally schema-qualified) of the table the statistics should be created on. You must be the owner of a table to create or change statistics on it. Create table t1 with two functionally dependent columns, i.e. knowledge of a value in the first column is sufficient for determining the value in the other column. Then functional dependencies are built on those columns: CREATE TABLE t1 ( a int, b int ); INSERT INTO t1 SELECT i/100, i/500 FROM generate_series(1,1000000) s(i); CREATE STATISTICS s1 ON (a, b) FROM t1; ANALYZE t1; -- valid combination of values EXPLAIN ANALYZE SELECT * FROM t1 WHERE (a = 1) AND (b = 0); -- invalid combination of values EXPLAIN ANALYZE SELECT * FROM t1 WHERE (a = 1) AND (b = 1); There's no CREATE STATISTICS command in the SQL standard.