SQL Server: how to create a stored procedure

问题:

I'm learning sql from a book and I'm trying to write a stored procedure but I don't believe that I'm doing it correctly. Is the following way not valid in Microsoft SQL? If not, when is it valid, if ever?

create procedure dept_count(in dept_name varchar(20), out d_count integer)
   begin
     select count(*) into d_count
     from instructor
     where instructor.dept_name=dept_count.dept_name
   end

I get the following error

Msg 156, Level 15, State 1, Procedure wine_change, Line 1 Incorrect syntax near the keyword 'in'.

回答1:

T-SQL

/* 
Stored Procedure GetstudentnameInOutputVariable is modified to collect the
email address of the student with the help of the Alert Keyword
*/



CREATE  PROCEDURE GetstudentnameInOutputVariable
(

@studentid INT,                   --Input parameter ,  Studentid of the student
@studentname VARCHAR (200) OUT,    -- Output parameter to collect the student name
@StudentEmail VARCHAR (200)OUT     -- Output Parameter to collect the student email
)
AS
BEGIN
SELECT @studentname= Firstname+' '+Lastname, 
    @StudentEmail=email FROM tbl_Students WHERE studentid=@studentid
END

回答2:

In T-SQL stored procedures for input parameters explicit 'in' keyword is not required and for output parameters an explicit 'Output' keyword is required. The query in question can be written as:

CREATE PROCEDURE dept_count 
    (
    -- Add input and output parameters for the stored procedure here
    @dept_name varchar(20), --Input parameter 
    @d_count int OUTPUT     -- Output parameter declared with the help of OUTPUT/OUT keyword
    ) 
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

     -- Statements for procedure here
    SELECT @d_count = count(*)
    from instructor
      where instructor.dept_name=@dept_name

END
GO

and to execute above procedure we can write as:

Declare @dept_name varchar(20), -- Declaring the variable to collect the dept_name
        @d_count int            -- Declaring the variable to collect the d_count 
SET @dept_name = 'Test'

Execute  dept_count @dept_name,@d_count output
SELECT   @d_count               -- "Select" Statement is used to show the output 

回答3:

I think it can help you:

CREATE PROCEDURE DEPT_COUNT
(
    @DEPT_NAME VARCHAR(20), -- Input parameter
    @D_COUNT INT OUTPUT     -- Output parameter
    -- Remember parameters begin with "@"
)
AS -- You miss this word in your example
BEGIN
    SELECT COUNT(*) 
    INTO #D_COUNT -- Into a Temp Table (prefix "#")
    FROM INSTRUCTOR
    WHERE INSTRUCTOR.DEPT_NAME = DEPT_COUNT.DEPT_NAME
END

Then, you can call the SP like this way, for example:

DECLARE @COUNTER INT
EXEC DEPT_COUNT 'DeptName', @COUNTER OUTPUT
SELECT @COUNTER

回答4:

Try this:

 create procedure dept_count(@dept_name varchar(20),@d_count int)
       begin
         set @d_count=(select count(*)
                       from instructor
                        where instructor.dept_name=dept_count.dept_name)
         Select @d_count as count
       end

Or

create procedure dept_count(@dept_name varchar(20))
           begin
            select count(*)
                           from instructor
                            where instructor.dept_name=dept_count.dept_name
           end

回答5:

CREATE PROCEDURE [dbo].[USP_StudentInformation]
@S_Name VARCHAR(50)
,@S_Address VARCHAR(500)
AS
BEGIN
SET NOCOUNT ON;

DECLARE @Date VARCHAR(50)

SET @Date = GETDATE()


IF EXISTS (
        SELECT *
        FROM TB_StdFunction
        WHERE S_Name = @S_Name
            AND S_Address = @S_Address
        )
BEGIN
    UPDATE TB_StdFunction
    SET S_Name = @S_Name
        ,S_Address = @S_Address
        ,ModifiedDate = @Date
    WHERE S_Name = @S_Name
        AND S_Address = @S_Address

    SELECT *
    FROM TB_StdFunction
END
ELSE
BEGIN
    INSERT INTO TB_StdFunction (
        S_Name
        ,S_Address
        ,CreatedDate
        )
    VALUES (
        @S_Name
        ,@S_Address
        ,@date          
        )

    SELECT *
    FROM TB_StdFunction
END
END

---

Table Name :   TB_StdFunction


S_No  INT PRIMARY KEY AUTO_INCREMENT
S_Name nvarchar(50)
S_Address nvarchar(500)
CreatedDate nvarchar(50)
ModifiedDate nvarchar(50)

回答6:

Create this way.

Create procedure dept_count(dept_name varchar(20),d_count integer)
   begin
     select count(*) into d_count
     from instructor
     where instructor.dept_name=dept_count.dept_name
   end

回答7:

try this:

create procedure dept_count( @dept_name varchar(20), @d_count INTEGER out)

   AS
   begin
     select count(*) into d_count
     from instructor
     where instructor.dept_name=dept_count.dept_name
   end