使用PostgreSQL更新同一查询中的多行 [英] Update multiple rows in same query using PostgreSQL

问题描述

我正在寻找在一条语句中更新PostgreSQL中的多行的方法.有没有办法执行以下操作?

I'm looking to update multiple rows in PostgreSQL in one statement. Is there a way to do something like the following?

UPDATE table 
SET 
 column_a = 1 where column_b = '123',
 column_a = 2 where column_b = '345'

推荐答案

您还可以使用 update ... from 语法并使用映射表.如果您要更新多个列，则可以更通用:

You can also use update ... from syntax and use a mapping table. If you want to update more than one column, it's much more generalizable:

update test as t set
    column_a = c.column_a
from (values
    ('123', 1),
    ('345', 2)  
) as c(column_b, column_a) 
where c.column_b = t.column_b;

您可以添加任意多的列:

You can add as many columns as you like:

update test as t set
    column_a = c.column_a,
    column_c = c.column_c
from (values
    ('123', 1, '---'),
    ('345', 2, '+++')  
) as c(column_b, column_a, column_c) 
where c.column_b = t.column_b;

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