子查询返回的值超过1。子查询用作表达式

Question

我正面临问题：

子查询返回了多个值。当子查询遵循=，！=，<，<=，>，> =或将子查询用作表达式时，不允许这样做。

if和else如果条件正常，但else条件不正常。 并在SQL Server中显示问题：

alter proc spSearch  'Cook','205'
(
@SearchName Nvarchar(Max),
@AdminStatus nvarchar(max)
)
as
begin
Declare @SearchRecipeKey AS Nvarchar(Max)
Declare @SearchChefKey AS Nvarchar(Max)
SET @SearchRecipeKey = (SELECT  Recipes.RecipeName FROM Recipes WHERE Recipes.RecipeName LIKE '%'+@SearchName+'%')
SET @SearchChefKey = (SELECT Chef.FirstName+' '+Chef.LastName as FullName FROM Chef WHERE (Chef.FirstName+' '+Chef.LastName) LIKE '%'+@SearchName+'%')
if((@SearchRecipeKey IS NOT NULL) and (@SearchChefKey IS NULL))
    Begin
		select Recipes.RecipeId, Recipes.RecipeName, 1 as Flag from Recipes       
        where Recipes.RecipeName LIKE '%'+@SearchName+'%'
       and Recipes.AdminStatus=@AdminStatus ORDER BY Recipes.RecipeName ASC;
	 End
	 else if ((@SearchRecipeKey IS  NULL) and (@SearchChefKey IS NOT NULL))
	 Begin
	 select Chef.ChefId,Chef.FirstName+' '+Chef.LastName as FullName, uinfo.UserType,Chef.EmailId, 2 as Flag  from Recipes
       inner join Chef on Recipes.ChefId = Chef.ChefId 
        full join Users uinfo on Chef.EmailId = uinfo.EmailId
        where (Chef.FirstName+' '+Chef.LastName) LIKE '%'+@SearchName+'%'
       and Recipes.AdminStatus=@AdminStatus ORDER BY  FullName ASC;
	 End
	 else 
    Begin
		select Recipes.RecipeId, Recipes.RecipeName,Chef.ChefId,Chef.FirstName+' '+Chef.LastName as FullName, uinfo.UserType,Chef.EmailId, 3 as Flag  from Recipes
       inner join Chef on Recipes.ChefId = Chef.ChefId 
        inner join Users uinfo on Chef.EmailId = uinfo.EmailId
         where (Chef.FirstName+' '+Chef.LastName) LIKE '%'+@SearchName+'%' or Recipes.RecipeName LIKE '%'+@SearchName+'%'
       and Recipes.AdminStatus=@AdminStatus ORDER BY Recipes.RecipeName, FullName ASC;
	 End
	
	 End

Answer 1

您在查询中使用Select TOP 1。

顶部1在查询中仅选择第一个值。

alter proc spSearch  'Cook','205'
(
@SearchName Nvarchar(Max),
@AdminStatus nvarchar(max)
)
as
begin
Declare @SearchRecipeKey AS Nvarchar(Max)
Declare @SearchChefKey AS Nvarchar(Max)
SET @SearchRecipeKey = (SELECT TOP 1  Recipes.RecipeName FROM Recipes WHERE Recipes.RecipeName LIKE '%'+@SearchName+'%')
SET @SearchChefKey = (SELECT TOP 1 Chef.FirstName+' '+Chef.LastName as FullName FROM Chef WHERE (Chef.FirstName+' '+Chef.LastName) LIKE '%'+@SearchName+'%')
if((@SearchRecipeKey IS NOT NULL) and (@SearchChefKey IS NULL))
    Begin
        select Recipes.RecipeId, Recipes.RecipeName, 1 as Flag from Recipes       
        where Recipes.RecipeName LIKE '%'+@SearchName+'%'
       and Recipes.AdminStatus=@AdminStatus ORDER BY Recipes.RecipeName ASC;
     End
     else if ((@SearchRecipeKey IS  NULL) and (@SearchChefKey IS NOT NULL))
     Begin
     select Chef.ChefId,Chef.FirstName+' '+Chef.LastName as FullName, uinfo.UserType,Chef.EmailId, 2 as Flag  from Recipes
       inner join Chef on Recipes.ChefId = Chef.ChefId 
        full join Users uinfo on Chef.EmailId = uinfo.EmailId
        where (Chef.FirstName+' '+Chef.LastName) LIKE '%'+@SearchName+'%'
       and Recipes.AdminStatus=@AdminStatus ORDER BY  FullName ASC;
     End
     else 
    Begin
        select Recipes.RecipeId, Recipes.RecipeName,Chef.ChefId,Chef.FirstName+' '+Chef.LastName as FullName, uinfo.UserType,Chef.EmailId, 3 as Flag  from Recipes
       inner join Chef on Recipes.ChefId = Chef.ChefId 
        inner join Users uinfo on Chef.EmailId = uinfo.EmailId
         where (Chef.FirstName+' '+Chef.LastName) LIKE '%'+@SearchName+'%' or Recipes.RecipeName LIKE '%'+@SearchName+'%'
       and Recipes.AdminStatus=@AdminStatus ORDER BY Recipes.RecipeName, FullName ASC;
     End

     End