怎么写一个sql语句，可以检查一个字段的值，如果是true返回1，是false返回0？多谢！

[charlesxu]

要求返回0或者1的时候就像返回这个字段的值一样。

[百年树人]

select case when 字段='true' the 1 else 0 end from tb

[cd731107]

select case when 字段='true' then 1 else 0 end as [新字段名]

[闹铃]

select case value 
       when 'true'  then 1 
       when 'false' then 0  end

[-晴天]

不明白楼主的意思,在MSSQL里,逻辑型数据是由bit类型来处理的,true 就是1,false 就是0.

create table tb(col bit)
insert into tb select 1 union all select 0
go
select * from tb
/*
col
-----
1
0

(2 行受影响)

*/
go
drop table tb

[liang145]

create table #tb(bool bit)
insert #tb
select 'true' union all
select 'false' union all
select 'false' union all
select 'true' 

select case bool when 'true' then 1 else 0 end as bool from #tb

[charlesxu]

比如：Table01

字段01，字段02，字段03
true, false, true

怎么返回以下的报表：
字段01 1
字段02 0
字段03 1

[attababy]

select
case value
when 1 then 'true'
when 0 then 'false'
else 'unknown'
end
from ...

[liang145]

create table Table01
(字段01 bit,字段02 bit,字段03 bit)
insert Table01
select 'true', 'false', 'true' union all
select 'false', 'false', 'true' 

declare @sql nvarchar(4000)
set @sql=''
select @sql=@sql+' union all select Rowid,'''+[name]+''' as ColnumName,'
                +'case when '+[name]+'=''true'' then 1 else 0 end as [value] from T' from sys.columns
where [object_id]= object_id('Table01')
set @sql=';with T as (select Row_number()over(order by getdate()) as Rowid,* from Table01)'+
         stuff(@sql,1,10,'')
exec(@sql)

--Rowid                ColnumName value
---------------------- ---------- -----------
--1                    字段01       1
--2                    字段01       0
--1                    字段02       0
--2                    字段02       0
--1                    字段03       1
--2                    字段03       1
--
--(6 row(s) affected)