IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_schema='ent' AND table_name='AdsPlatform' AND column_name='Name') THEN UPDATE ent."AdsPlatform" SET "PlatfromSettlementParty"="Name" WHERE "PlatfromSettlementParty" is null; ELSE UPDATE ent."AdsPlatform" SET "PlatfromSettlementPar...
\d tblname 查看表结构 \di 查看索引 create database [数据库名] 创建数据库 drop database [数据库名] 删除数据库 alter table [表名A] rename to [表名B] 重命名一个表 drop table [表名] 删除一个表 alter table [表名] add column [字段名] [类型] 在已有的表里添加字段 alter table [表名...
postgresql change table 后端开发 --if cloumn existSELECTEXISTS(SELECT1FROMinformation_schema.columnsWHEREtable_schema='ent'ANDtable_name='AdsPlatform'ANDcolumn_name='Name');--add cloumnALTERTABLEfinance."MappingInfo"ADDCOLUMNIFNOTEXISTS"Active"boolean;UPDATEfinance."MappingInfo"SET"Active"=falsewhere"...
rebuild_constraints,优先采用这种方式 它先通过alter table t2 drop fk1,add _fk1重建外键参考,指向新表 再rename t1 t1_old, _t1_new t1,交换表名,不影响客户端 删除旧表 t1_old 但如果字表t2太大,以致alter操作可能耗时过长,有可能会强制选择 drop_swap。 涉及的主要方法在 pt-online-schema-change 文...
PostgreSQL has rename table statement which is used with rename clause to change the name of an existing table. Syntax: ALTER TABE table_name RENAME to new_table_name; In the above statement, first you specify the existing table name which you want to rename and secondly, specify new table...
在表分析前边变动的尺寸 同时对于一些不变动的表也可以关掉auto_vacuum,另外可以通过pg_class中的字段 reloptions 查看到底这个表的的auto_vacuum 是打开的状态还是关闭的状态. ALTER TABLE table_name SET (autovacuum_enabled = false);
CREATE TABLE t_record_change( table_name varchar(32) primary key, last_update_time timestamp(6) with time zone, trans_id varchar(32), commited numeric(1,0) ); 二、创建触发器函数 --创建触发器函数 create or replace function f_update_change_log() returns trigger as $$ ...
INSERT INTO TABLE_NAME (column1, column2, column3,...columnN)VALUES (value1, value2, value3,...valueN); 例:insert into postgtest (title,content) values('title1','content1'); 执行结果INSERT 0 1 ( INSERT 0 # 插入多行返回的信息, # 为插入的行数。)检索 ...
model(tablename, schema = null) 返回Model实例去执行SQL。 transaction(callback, schema) 事务执行,其内部是调用了Model实例的transaction。 复杂查询 letpqorm = initORM(dbconfig); ;(async() =>{letcond = {is_delete:0,nickname: {'ILIKE':'%ae%'} ...
-- change distribution column SELECT alter_distributed_table('github_events', distribution_column:='event_id'); -- change shard count of all tables in colocation group SELECT alter_distributed_table('github_events', shard_count:=6, cascade_to_colocated:=true); -- change colocation SELECT alte...