案件条件在何种情况下

Question

我想创建一个接受可选参数的存储过程。 我想完成以下内容：

CREATE PROC myProc(@myCriteria Int) AS
SELECT myFieldList
FROM myTable
IF @myCriteria IS NOT NULL
WHERE myCriteria = @myCriteria

Answer 1

试试这个。

CREATE PROC myProc(@myCriteria Int) AS
SELECT myFieldList
FROM myTable
WHERE (myCriteria = @myCriteria) or (@myCriteria IS NULL and 1=1) 

更新了Phillip建议

CREATE PROC myProc(@myCriteria Int) AS
SELECT myFieldList
FROM myTable
WHERE (@myCriteria is null OR myCriteria = @myCriteria)