Question

我试图在SQL Server 2005中的where子句中添加一个列，但问题是我必须为给定条件添加它，如

where condition  1
and condition 2
if(@val !=null and @val = 'test')
begin
and condition 3
end

但是当我尝试这个SQL Server时给了我错误：

Incorrect syntax near the keyword 'and'. Severity 15 Procedure Name
Incorrect syntax near 'END'. Severity 15 Procedure Name

我做了一些R＆amp; D，发现我应该使用case语句，然后我尝试了这个

where condition  1
    and condition 2
    CASE @val 
    WHEN 'test' THEN AND condition 3
END

但是现在它给出了错误：

Incorrect syntax near the keyword 'CASE'. Severity 15 Procedure Name

任何人都可以帮我解决问题吗？谢谢。

修改

select *
from Tables with joins
where ac_jd_date_closed >= convert(VARCHAR(10),dateadd(dd, -@period, getdate()), 101)
and ac_jd_date_closed <= convert(VARCHAR(10),dateadd(dd, 0, getdate()), 101) 
and lo_pc_last_name not in ('Shroder')
and lm_ap_pr_id NOT IN (4743, 2683)

我想在spm David中添加这个条件，否则这个条件不应该存在。

Answer 1

您可以删除CASE语句并替换AND (@Val<> 'test' OR (@Val = 'test' AND condition 3))：

WHERE <condition  1>
AND <condition 2>
AND (@Val<> 'test' OR (@Val = 'test' AND <condition 3>))

Answer 2

where condition  1
and condition 2
and ((@val='test' and condition 3) Or (@val!='test'))

Answer 3

感谢所有人回答这个问题，但我用一个小技巧以这种方式解决问题

if(@spm='David')
begin

select *
    from Tables with joins
    where ac_jd_date_closed >= convert(VARCHAR(10),dateadd(dd, -@period, getdate()), 101)
    and ac_jd_date_closed <= convert(VARCHAR(10),dateadd(dd, 0, getdate()), 101) 
    and lo_pc_last_name not in ('Shroder')
    and lm_ap_pr_id NOT IN (4743, 2683) 
end  
else 
begin 
select *
    from Tables with joins
    where ac_jd_date_closed >= convert(VARCHAR(10),dateadd(dd, -@period, getdate()), 101)
    and ac_jd_date_closed <= convert(VARCHAR(10),dateadd(dd, 0, getdate()), 101) 
    and lo_pc_last_name not in ('Shroder')
end

意味着我使用了相同的完整查询条件，希望这个技巧可以帮助某人解决他的问题。

在sql server where子句中使用if / case

3 个答案: