sql查询将城市浦那替换为孟买和孟买以填补表格

Question

我有一个表名为emp的列名

city                         output table
-----
mumbai                           pune
pune                             mumbai
mumbai                           pune
pune                             mumbai
pune                             mumbai

我希望更新查询将pune替换为mumbai和mumbai to pune

Answer 1

您可以使用查询执行此操作：

select (case when city = 'mumbai' then 'pune'
             when city = 'pune' then 'mumbai'
             else city
        end)
. . .

如果您想更改值，请：

update table t
     set city = (case when city = 'mumbai' then 'pune'
                      when city = 'pune' then 'mumbai'
                 end)
     where city in ('mumbai', 'pune');

Answer 2

尝试以下方法：

UPDATE TABLENAME
SET city= (
CASE 

WHEN city = 'mumbai'
THEN 'pune'

WHEN city = 'pune'
THEN 'mumbai'

END )

希望它有所帮助。