Question

如何修复语法，我想只根据用户输入执行一个select语句，即@id

Create Procedure employee
    @id int,
    @year int
AS
    SELECT 
        CASE 
           WHEN @id = 1 
             THEN (select a.name, b.roles 
                   from employee a 
                   inner join department b on a.id = b.id
                   where b.years in (@year) 
                      or b.roles is not null) 
           ELSE 
              CASE 
                 WHEN @id = 2 
                   THEN (select a.name, b.dayoff 
                         from employee a 
                         inner join department b on a.id = b.id
                         where b.years in (@year) 
                            or b.dayoff is not null)

Answer 1

据推测，您需要if：

Create Procedure employee (
    @id int,
    @year int
)
AS
BEGIN
    IF @id = 1
    BEGIN
        select a.name, b.roles
        from employee a join
             department b
             ON a.id = b.id
             where b.years IN (@year) OR b.roles IS NOT NULL  ) ;
    END
    ELSE if @id = 2 
    BEGIN 
        select a.name, b.dayoff
        from employee a join
             department b
             ON a.id = b.id
        where b.years IN (@year) OR b.dayoff IS NOT NULL  ) ;
    END
END;

我不确定您为何in使用@year;这仅在@year中有一个值时才有效。

Answer 2

更改以下行

 SELECT CASE WHEN @id = 1 THEN

到此

IF @id = 1 THEN

因为你不能像这样使用CASE表达式，它应该在查询中使用。这样你的代码块应该看起来像

IF @id = 1 THEN

(select a.name, b.roles from employee a 
INNER JOIN department b ON a.id = b.id
where b.years IN (@year) 
OR b.roles IS NOT NULL  ) 

ELSE 

(select a.name, b.dayoff from employee a 
INNER JOIN department b ON a.id = b.id
where b.years IN (@year) 
OR b.dayoff IS NOT NULL  )

'）附近的语法不正确

2 个答案: