DELETE FROM orders WHERE order_id = 1 OR order_status = '未付款';```5. 使用 RETURNING cla...
The RETURNING clause returns the deleted rows, which is useful for verification or further processing. Delete with ON DELETE CASCADEThis example demonstrates how to delete rows from a parent table and automatically delete related rows from a child table: delete_cascade.sql ...
在DELETE 中,可用于 RETURNING 的数据是已删除行的内容。例如: DELETEFROMproductsWHEREobsoletion_date='today'RETURNING*; 如果目标表上有触发器,则 RETURNING 可用的数据是触发器修改的行。因此,检查由触发器计算的列是 RETURNING 的另一个常见用例。
For example, the following statement deletes rows from a table and returns the values of the id of the deleted rows: DELETE FROM table_name WHERE condition RETURNING id; If you delete data from a table based on data from another table, you can use the DELETE JOIN statement. To delete da...
INSERT INTO ... VALUES(...) RETURNING COL1 INTO :COL1; UPDATE ... SET ... RETURNING COL1 INTO :COL1; DELETE FROM ... RETURNING COL1 INTO :COL1; 1. 2. 3. 使用RETURNING不仅可以返回多列数据,也可以返回数据保存在数组等数据类型中: ...
COPY: COPY pguser.tbl_batch4 FROM '/home/pg10/tbl_batch4.txt'; 2.3 RETURNING 插入:INSERT INTO test(a_boolean) VALUES ('f') RETURNING *; 更新:UPDATE test SET a_boolean='f' RETURNING *; 删除:DELETE FROM test RETURNING *; 2.4 UPSERT ...
MyBatis 注解接收 PostgreSQL 的 returning 结果 mybatis 注解select,mybatis常用注解有:@Select、@SelectKey、@Insert、@Update、@Delete。以及结果集三大注解:@Result、@Results、@ResultMap;除此之外还有:@One、@Many等,接下来一一介绍这些注解。@Select注解:@Sel
2840 DELETE 0 – 没有删除数据. 因为tg_t_ret触发器函数返回空. postgres=# select * from t_ret; id | info | crt_time —-+——+———- 1 | abc | 2013-03-10 20:38:50.951669 (1 row) – before for each row 的返回值不影响returning的值, returning 的值来自真实的受影响的行数据....
MERGE 可以在单个语句中实现 INSERT、UPDATE 以及 DELETE 操作。 PostgreSQL 17 进一步增强了该语句的功能,包括: 支持RETURNING 子句,可以返回新增、更新或者删除的数据行; 支持WHEN NOT MATCHED BY SOURCE 操作,用于操作源表中不存在但是目标表中存在的数据行。 RETURNING 子句 PostgreSQL 支持 INSERT、UPDATE 以及 ...
] ] DELETE FROM [ ONLY ] table_name [ * ] [ [ AS ] alias ] [ USING using_list ] [ WHERE condition | WHERE CURRENT OF cursor_name ] [ RETURNING * | output_expression [ [ AS ] output_name ] [, ...] ] postgres=# \quit 6.DML操作,生成数据 代码语言:javascript 代码运行次数:0...