drop index if exists "t_user_pkey"; alter table "t_user" add constraint "t_user_pkey" primary key ("ID"); 根据已有表结构创建表 create table if not exists 新表 (like 旧表 including indexes including comments including defaults); 删除表 drop table if exists "t_template" cascade; 查询注...
drop index if exists t_user_username; create index t_user_username on t_user (username); 1. 2. 创建唯一索引: drop index if exists t_user_username; create unique index t_user_username on t_user (username); 1. 2. 查看索引: \d t_user 1. 删除索引: drop index t_user_username; 1....
ALTER INDEX [IF EXISTS] schema_name.old_name RENAME TO new_name; 1. 例子: ALTER INDEX IF EXISTS viid_vehicle.idx_vehiclestructured_recordid RENAME TO idx_vehiclestructured_recordid1; 1. 2.3 删除索引 DROP INDEX [IF EXISTS] schema_name.index_name; 1. 例子: DROP INDEX IF EXISTS viid_vehi...
postgres=#alterindexidx_name_oldset(fillfactor=70); -- 修改索引的填充因子ALTERINDEXpostgres=#alterindexidx_name_old reset(fillfactor); -- 充值索引的填充因子ALTERINDEXpostgres=# 删除索引 语法: Syntax:DROPINDEX[CONCURRENTLY][IF EXISTS]name[, ...][CASCADE | RESTRICT]URL: https://www.postgresql....
(3.5)备份db1数据库的表schema1.t1,并使用--clean选项创建带有drop table、drop index的sql文件 [postgres@pg01pg_backup]$ pg_dump--username=lijiaman --password --host=192.168.10.11 --port=5432 --dbname=db1 --table=schema1.t1 --format=plain --file=/home/postgres/pg_backup/db1_schema1_t1...
IF parent_id_values=0 or name_values=0 THEN RAISE EXCEPTION '%', 'Foreign key constraint violated because the id column value and idname column value does not exist in the parent table and parent1 table .'; else RETURN NEW; end if; end; / --触发器 DROP TRIGGER if exists tri_child...
6)导出时导出drop database和create database语句。需注意,导入时如有用户连接这该库,则drop语句执行失败 pg_dump -s yzs -C -c -f 1.txt 7、-t指定导出某些表,只导出item开头的表等对象 pg_dump -t temp* -f 1.txt yzs 8、-n只导出指定的schema,可以多个-n;-N指定不导出的schema...
在前面的示例中,在"immv"的AID和BID列上创建了唯一的索引"immv_index",这样可以快速更新视图。删除此索引会使更新视图花费较长时间。 test=#DROPINDEX immv_index;DROPINDEXtest=#UPDATEpgbench_accountsSETabalance=9876WHEREaid=1;UPDATE1Time:3224.741ms(00:03.225) ...
13、sortDumpableObjectsByTypeName、sortDataAndIndexObjectsBySize(如果是并行dump,需要按表大小排序)、sortDumpableObjects把所有对象重新排列:不同类型对象导出优先级依赖于dbObjectTypePriority数组;相同类型按名称排序static const int dbObjectTypePriority[] = { 1, /* DO_NAMESPACE */ 4, /* DO_EXTENSION *...
to json SELECT'{"bar":"baz","balance":7.77,"active":false}'::json;to text SELECT*from batch_infowhereposition('ADD'instat_info::text)>0; alter ALTERTABLEad_rs_barrieraddcolumn upd_helpvarchar(1024);alter table ad_rs_barrier drop columnifexists confidence_help; ...