ALTER[COLUMN]columnTYPE type [ USING expression ] ALTER[COLUMN]columnSETDEFAULTexpression ALTER[COLUMN]columnDROPDEFAULT ALTER[COLUMN]column{SET|DROP}NOTNULL ALTER[COLUMN]columnSETSTATISTICSinteger ALTER[COLUMN]columnSETSTORAGE { PLAIN | EXTERNAL | EXTENDED | MAIN } ADDtable_constraint DROPCONSTRAINTconst...
ALTER TABLE table_name ADD CONSTRAINT MyPrimaryKey PRIMARY KEY (column1, column2...); DROP CONSTRAINT (删除约束),语法如下: ALTER TABLE table_name DROP CONSTRAINT MyUniqueConstraint; 如果是 MYSQL ,代码是这样: ALTER TABLE table_name DROP INDEX MyUniqueConstraint; DROP PRIMARY KEY (删除主键),语...
ALTER TABLE [ ONLY ] name [ * ] action [, ... ] ALTER TABLE [ ONLY ] name [ * ] RENAME [ COLUMN ] column TO new_column ALTER TABLE name RENAME TO new_name 其中action 可以是以选项之一: ADD [ COLUMN ] column_type [ column_constraint [ ... ] ] DROP [ COLUMN ] column [ RE...
ALTER [COLUMN] COLUMN TYPE type ALTER [COLUMN] COLUMN SET DEFAULT EXPRESSION ALTER [COLUMN] COLUMN DROP DEFAULT ALTER [COLUMN] COLUMN {SET | DROP} NOT NULL ALTER [COLUMN] COLUMN SET STATISTICS INTEGER ALTER [COLUMN] COLUMN SET STORAGE {PIALN | EXTERNAL | EXTENDED | MAIN } ADD TABLE _CON...
alter user 用户名setdefault_transaction_read_only=on;#设置可操作的数据库 grant all on database 数据库名 to 用户名;#设置可操作的模式和权限 grant select,insert,update,deleteon all tablesinschemapublicto 用户名; 撤回权限 代码语言:javascript ...
-- 创建自增序列alter sequence "t_user_ID_seq" restart with 1 increment by 1; -- 创建主键序列 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
constraint PK_SysUser primary key("UserId") ); --说明:使用[表]级约束设置主键,可以设置一列或多列作为主键,主键默认名称为tablename_pkey,constraint PK_SysUser可省略。 1. 2. 3. 4. 5. 6. 7. 3.通过修改表结构设置主键 --语法:alter table table_name add [constraint constraint_name] primary...
一创建分区CREATE TABLE log_ins_201802(LIKE log_ins INCLUDING ALL); 一添加约束ALTER TABLE log ins 201802 ADD CONSTRAINT log ins 201802_create_ time_check CHECK ( create time >=’2018-02-01’ANDcreate time <’2018-03-01’); 一刷新触发器函数logins insert trigger() 函数刷新前建议先备份函数...
digoal=# alter table cl inherit pl; ERROR: child table is missing constraint"pl_cl_check" //当此时再将该表加入继承时,系统报错。因为在加入继承时,系统会对该表的非空约束以及普通约束进行检查,检查其是否与父表一致,若不一致,则不可以为该表加入继承关系。
ALTERTABLEtable_nameALTERCOLUMN column_name[SET NOT NULL| DROP NOT NULL]; To add aCHECKconstraint, you useALTER TABLE ADD CHECKstatement: ALTERTABLEtable_nameADDCHECKexpression; Generally, to add a constraint to a table, you useALTER TABLE ADD CONSTRAINTstatement: ...