Question

我有两个参数，@ ID和@Name，我也有两个单独的输入字段，只有一个必须执行，唯一一个将被执行的是非空的，或者如果你有一个其他方法的想法，请帮助

示例查询字符串：

"SELECT * FROM accounts WHERE id = @ID or name = @Name"

我的查询字符串：

select 
i.ssn_or_tin,
x.name,
i.cusid,
x.account_no,
i.dateTrans,
i.transCode,
d.TransDesc,
i.transdescription_1,
i.debit_or_credit,
coalesce((case when i.debit_or_credit = 'Dr' then i.debit end),0) as Debit,
coalesce((case when i.debit_or_credit = 'Cr' then i.debit end),0) as Credit,
(coalesce(c.debit,0))as cashin,
i.source 
from source_ips i left join 
(select distinct * from source_cash_in_original where  transCode ='966') as c on (i.ssn_or_tin =c.ssntin and i.cusid=c.cusid and i.accountNo = c.accountNo) and i.dateTrans=c.dateTrans and i.transCode='131' left join
(select distinct * from source_cash_out_original where  transCode ='936') as o on (i.ssn_or_tin =o.ssntin and i.cusid=o.cusid and i.accountNo = o.accountNo) and i.dateTrans=o.dateTrans and i.transCode='131' left join
TransDescriptions d on i.transCode = d.TransCode
left join (select a.customer_id,a.account_no,d.ssn_or_tin,a.name from customer_account a left outer join customer_data d on a.customer_id =d.customer_id)as x on i.ssn_or_tin = x.ssn_or_tin and i.cusid=x.customer_id and i.accountNo = x.account_no
where (i.ssn_or_tin = @ssn_or_tin or @ssn_or_tin is null or x.name = @name or @name is null) and i.dateTrans between '2014-12-01' and '2016-08-02' order by i.dateTrans ASC

Answer 1

IF @NAME is null
( SELECT * FROM accounts WHERE id = @ID ) ;
ELSE 
(SELECT * FROM accounts WHERE id = @NAME) ;

Answer 2

通用机制是：

SELECT a.*
FROM accounts a
WHERE a.id = @ID OR @ID IS NULL OR
      a.name = @Name OR @Name IS NULL;

请注意。如果您在id和name上有索引，则不会使用它们（可能）。根据数据库的不同，您可能需要动态SQL才能在两种情况下都使用索引（这是因为在第一次运行存储过程时编译查询）。

SQL Query查询字符串中的多个参数，但必须只能执行

2 个答案: