CREATE OPERATOR CLASS定义一个新的操作符表。CREATE OPERATOR CLASS name [ DEFAULT ] FOR TYPE data_type USING index_method AS { OPERATOR strategy_number operator_name [ ( op_type, op_type ) ] [ RECHECK ] | FUNCTION support_number func_name ( argument_type [, ...] ) | STORAGE storage_...
CREATEOPERATORFAMILY integer_ops USING btree; CREATEOPERATORCLASSint8_opsDEFAULTFORTYPEint8 USING btree FAMILY integer_opsAS-- 标准 int8 比较OPERATOR1< ,OPERATOR2<= ,OPERATOR3= ,OPERATOR4>= ,OPERATOR5> ,FUNCTION1btint8cmp(int8, int8),FUNCTION2btint8sortsupport(internal);CREATEOPERATORCLASSint4...
以int4 支持 B-tree 索引定义int4_opsopclass 为例,假设用 SQL 定义,可以写为: CREATE OPERATOR CLASS int4_ops DEFAULT FOR TYPE int4 USING btree FAMILY integer_ops AS -- operator set (strategies) OPERATOR 1 <(int4, int4) , OPERATOR 2 <=(int4, int4) , OPERATOR 3 =(int4, int4) ...
PostgreSQL 命令-CREATE DATABASE PostgreSQL 命令-CREATE DOMAIN PostgreSQL 命令-CREATE FUNCTION PostgreSQL 命令-CREATE GROUP PostgreSQL 命令-CREATE INDEX PostgreSQL 命令-CREATE LANGUAGE PostgreSQL 命令-CREATE OPERATOR PostgreSQL 命令-CREATE OPERATOR CLASS ...
CREATE OPERATOR CLASS 定义一个新的操作符表。 CREATE OPERATOR CLASS name [ DEFAULT ] FOR TYPE data_type USING index_method AS { OPERATOR strategy_number operator_name [ ( op_type, op_type ) ] [ RECHECK ] | FUNCTION support_number func_name ( argument_type [, ...] ) ...
CREATE OPERATOR CLASS 定义一个新的操作符表。 CREATE OPERATOR CLASS name [ DEFAULT ] FOR TYPE data_type USING index_method AS { OPERATOR strategy_number operator_name [ ( op_type, op_type ) ] [ RECHECK ] | FUNCTION support_number func_name ( argument_type [, ...] ) ...
tuples_fetched tuples_fetched from t),costs(startup_cost, run_cost) AS ( SELECT ( SELECT round( 358 /* child node cost */ + 0.1 * current_setting('cpu_operator_cost')::real * reltuples * 0.01027850 ) FROM pg_class WHERE relname = 'idx_a_t1' ), ...
postgresql 创建索引:ERROR: operator class "gin_trgm_ops" does not exist for access method "gin" g_trgmis an extension, so: CREATEEXTENSION pg_trgm; If you get the following error ERROR: could not open extension control file ".../extension/pg_trgm.control":...
driver-class-name: org.postgresql.Driver # 修改连接地址 url: jdbc:postgresql://数据库地址/数据库名?currentSchema=模式名&useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false Postgres相比MySQL多了一层模式的概念， 一个数据库下可以有多个模式。这里的模型名等价于以前的MySQL的数据...
CREATE/ALTER/DROP AGGREGATE 聚集函数的定义、修改和删除。 CREATE/ALTER/DROP OPERATOR 操作符(OPERATOR)的创建、修改和删除。 CREATE/ALTER/DROP OPERATOR CLASS 操作符类(OPERATOR CLASS)的创建、修改和删除。 CREATE/ALTER/DROP OPERATOR FAMILY 操作符族(OPERATOR FAMILY)的创建、修改和删除。 CREATE/ALTER/DROP ...