postgresql 两表关联更新操作
我就废话不多说了,大家还是直接看代码吧~
UPDATE 要更新的表
SET 字段1 = cqt.字段1,
字段2 = cqt.字段2,
FROM
数据来源表 cqt
WHERE
要更新的表.bsm = cqt.bsm
补充:Postgresql 连表更新字段语法 update
下面这段sql本来目的是想更新条件下的数据,可是这段sql却更新了整个表的数据。sql如下:
UPDATE tops_visa.visa_order
SET op_audit_abort_pass_date = now()
FROM
tops_visa.visa_order as t1
INNER JOIN tops_visa.visa_visitor as t2
ON t1. ID = t2.order_id
WHERE
t1.op_audit_abort_pass_date IS NULL
AND (
t2. STATE = ‘pch_abort_op_audit_pass’
OR t2. STATE = ‘pvd_abort_op_audit_pass’
)
正确的写法有多种,如下方法也能够实现正确的数据库修改:
UPDATE tops_visa.visa_order as t1
SET op_audit_abort_pass_date = now()
FROM
tops_visa.visa_visitor AS t2
WHERE
t1.ID = t2.order_id
AND t1.op_audit_abort_pass_date IS NULL
AND (
t2. STATE = ‘pch_abort_op_audit_pass’
OR t2. STATE = ‘pvd_abort_op_audit_pass’
)
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。如有错误或未考虑完全的地方,望不吝赐教。