如何在没有动态 sql (SQL Server 2012) 的情况下使用 patindex 过滤记录

Question

如何在 sql 服务器中使用 patindex 过滤记录（没有动态 sql）

例如：我有像

这样的记录

ID Name LastName Indicator
1 xxx     Lxxx     NULL
2 yyy     Lyyy     Yes
3 zzz     Lzzz     No

if @ind is null, i want to display all 3 records, if @ind ='Yes' then 2nd record should filter
if @ind = 'No' then 3rd record only should filter. 
please suggest some good solution and it should not affect performance.

sample:

declare @ind varchar(10) = 'Yes' (can be null, yes or No)
select * from 
(select 1 ID, 'xxx' Name,'Lxxx' LastName, NULL Indicator union all
select 2 ID, 'yyy' Name,'Lyyy' LastName, 'Yes' Indicator union all
select 3 ID, 'zzz' Name,'Lzzz' LastName, 'No' Indicator) x
where patindex('%' + isnull(@ind,'%') + '%', COALESCE(@ind,'%',Indicator)) > 0

Answer 1

您可以在 Where 子句中使用 Or 和 And 运算符来完成此操作。试试这个。

DECLARE @ind VARCHAR(10) = 'no' --(can be null, yes or No)

SELECT *
FROM   (SELECT 1 ID,'xxx'  Name,'Lxxx' LastName,NULL   Indicator
        UNION ALL
        SELECT 2 ID,'yyy'  Name,'Lyyy' LastName,'Yes'  Indicator
        UNION ALL
        SELECT 3 ID,'zzz'  Name,'Lzzz' LastName,'No'   Indicator) x
WHERE  ( @ind = 'Yes'
         AND name = 'yyy' )
        OR ( @ind = 'no'
             AND name = 'zzz' )
        OR ( @ind IS NULL )

如果你想使用 Patindex 使用这个。

DECLARE @ind VARCHAR(10) = 'yes' --(can be null, yes or No)

SELECT *
FROM   (SELECT 1 ID,'xxx'  Name,'Lxxx' LastName,NULL   Indicator
        UNION ALL
        SELECT 2 ID,'yyy'  Name,'Lyyy' LastName,'Yes'  Indicator
        UNION ALL
        SELECT 3 ID,'zzz'  Name,'Lzzz' LastName,'No'   Indicator) x
WHERE  ( patindex('Yes',@ind )>0
         AND name = 'yyy' )
        OR ( patindex('no',@ind )>0
             AND name = 'zzz' )
        OR ( @ind IS NULL )

Answer 2

我不明白为什么你必须使用 patindex，但如果你不这样做，这应该可以解决问题

declare @ind varchar(10) = 'Yes' (can be null, yes or No)
select * from 
(select 1 ID, 'xxx' Name,'Lxxx' LastName, NULL Indicator union all
select 2 ID, 'yyy' Name,'Lyyy' LastName, 'Yes' Indicator union all
select 3 ID, 'zzz' Name,'Lzzz' LastName, 'No' Indicator) x
where (@ind is null or indicator = @ind)

如何在没有动态 sql (SQL Server 2012) 的情况下使用 patindex 过滤记录

How to filter records using patindex without dynamic sql (SQL Server 2012)

sql-server