Question

我有一个SQL查询，我需要有条件地在WHERE子句中添加一个'AND'子句我有一个变量（@Payment）只需要包含在WHERE子句中，如果它是非null。我不应该使用IF条件。

这是我的代码..

SELECT Fname,lname,city, addressline1, state,zip
FROM table1 
JOIN addresstable on table1.id = addresstable.addid
WHERE state = @state
AND ((@Payment IS NULL) OR (payment LIKE + '%' + @Payment + '%' ) OR (payment LIKE + '%all%' ) )

在示例中，如果@Payment IS NULL，那么我不希望将最后一个'AND'子句添加到where子句。

Answer 1

试试这个：

select fname,lname,city, addressline1, state,zip
from table1 
join addresstable on table1.id = addresstable.addid
where state = @state
and (
      (@Payment is null)
      or 
      (payment like @PaymentLike)
)

当您调用此查询时。你需要传递2个参数。

@Payment
@PaymentLike

假设您将'payment'变量传递给@Payment

您将通过:(付款== null）？ “％all％”:(“％”+付款+“％”）到@PaymentLike

确保这项工作。

Answer 2

您不提供任何测试数据或架构，因此很难确定，但这可能就是您所需要的。

我不确定此条件的目的OR (payment LIKE + '%all%' )它会将结果限制为包含“all”一词的所有行。

我假设（虽然你没有在你的问题中说明）你试图从addresstable和table1中的任何匹配行返回所有行。使用left join。如果不是这种情况，您可以将此AND ((payment LIKE + '%' + COALESCE(@Payment,'') + '%' ) OR (payment LIKE + '%all%' ) )移回WHERE子句并将LEFT JOIN更改为INNER JOIN。

--Test data
DECLARE @table1 AS TABLE(addid INT, payment VARCHAR(20))
DECLARE @addresstable AS TABLE(addid INT, Fname VARCHAR(20),lname VARCHAR(20),city VARCHAR(20), addressline1 VARCHAR(20), [state] VARCHAR(20),zip VARCHAR(20))
DECLARE @Payment AS VARCHAR(20)
DECLARE @state VARCHAR(20)
SET @state='stateA'
INSERT INTO @table1 (addid, payment) VALUES(1,'payment 1')
INSERT INTO @table1 (addid, payment) VALUES(3,'payment 2')
INSERT INTO @table1 (addid, payment) VALUES(4,'payment 3')
INSERT INTO @table1 (addid, payment) VALUES(5,'payment 4')

INSERT INTO @addresstable (addid, Fname, lname, city, addressline1, [state], zip) VALUES (1, 'A', 'A', 'A', 'A', 'stateA', 'A')
INSERT INTO @addresstable (addid, Fname, lname, city, addressline1, [state], zip) VALUES (2, 'B', 'B', 'B', 'B', 'stateA', 'B')
INSERT INTO @addresstable (addid, Fname, lname, city, addressline1, [state], zip) VALUES (3, 'C', 'C', 'C', 'C', 'stateA', 'C')
INSERT INTO @addresstable (addid, Fname, lname, city, addressline1, [state], zip) VALUES (4, 'D', 'D', 'D', 'D', 'stateB', 'D')
INSERT INTO @addresstable (addid, Fname, lname, city, addressline1, [state], zip) VALUES (5, 'E', 'E', 'E', 'E', 'stateB', 'E')

--Query
SELECT Fname,lname,city, addressline1, state,zip, payment
FROM @addresstable a
LEFT JOIN @table1 t
    ON t.addid = a.addid
    AND ((payment LIKE + '%' + COALESCE(@Payment,'') + '%' ) OR (payment LIKE + '%all%' ) )
WHERE [state] = @state

在Where子句中添加条件'And'子句

2 个答案: