ALTER TABLE products ADD CHECK (name <> ''); ALTER TABLE products ADD CONSTRAINT some_name UNIQUE (product_no); ALTER TABLE products ADD FOREIGN KEY (product_group_id) REFERENCES product_groups; 要增加一个不能写成表约束的非空约束,使用下面语法: ALTER TABLE products ALTER COLUMN product_no SE...
Postgres: CREATE TABLE中的DEFAULT和数据库转储中的ALTER TABLE之间的差异 Alter DB2 table包含具有新的not null default '‘列的现有记录 如何避免在MySQL中alter table add column中出现重复的列名? 如何在不阻塞Postgresql语句的情况下执行alter table add column?
ALTER TABLE table_name ALTER column_name datatype NOT NULL; 给表中某列 ADD UNIQUE CONSTRAINT( 添加 UNIQUE 约束),语法如下: ALTER TABLE table_name ADD CONSTRAINT MyUniqueConstraint UNIQUE(column1, column2...); 给表中 ADD CHECK CONSTRAINT(添加 CHECK 约束),语法如下: ALTER TABLE table_name ADD...
ALTER TABLE myschema.distributors SET SCHEMA yourschema; ###To recreate a primary key constraint, without blocking updates while the index is rebuilt: CREATE UNIQUE INDEX CONCURRENTLY dist_id_temp_idx ON distributors (dist_id); ALTER TABLE distributors DROP CONSTRAINT distributors_pkey, ADD CONSTRAIN...
目前仅支持 UNIQUE、PRIMARY KEY 以及 FOREIGN KEY。 其中索引参数index_parameters为: [ WITH ( {storage_parameter = value} [, ... ] ) ] [ USING INDEX TABLESPACE tablespace_name ] 重命名表。对名称的修改不会影响所存储的数据。 ALTER TABLE [ IF EXISTS ] table_name RENAME [ TO | AS | ...
psql postgres -c "ALTER TABLE journal ALTER ekeyword TYPE character(350)" 好了,修改结束。 附ALTER语句的文档。 --- Name ALTER TABLE -- 修改表的定义 Synopsis ALTER TABLE [ ONLY ]name[ * ]action[, ... ] ALTER TABLE [ ONLY ]name[ ...
EDB Postgres Advanced Server Version 13 Documentation and release notes. Oracle database compatibility with higher security and data redaction for Enterprises.
When you execute anALTER TABLE...SPLIT PARTITIONcommand, EDB Postgres Advanced Server: Creates two new partitions Maintains the partitioning of the original table in the newly created partitions Redistributes the content of the old partition be...
⬜️ALTER TABLE name ADD [COLUMN] [IF NOT EXISTS] colname UNIQUE#6985 ⬜️ALTER TABLE name ADD [COLUMN] [IF NOT EXISTS] colname integer GENERATED ALWAYS AS IDENTITY [PRIMARY KEY] ✅ALTER TABLE name DROP [COLUMN] [IF NOT EXISTS] non_primary_column [RESTRICT | CASCADE] ...