sql [sql]标量值函数示例

Posted 2021-05-14

SELECT
  [P].[GUID] As [PlayerGUID],
  [dbo].[GetPlayerTotalPickCount]([P].[GUID]) [PickCount]
FROM 
  [Players] [P]

CREATE FUNCTION [dbo].[GetPlayerTotalPickCount]
(
  @PlayerGUID NVARCHAR(50) -- The foreign key to fetch corresponding records
)
RETURNS INT
AS
BEGIN

DECLARE @PickCount INT;

SELECT
  @PickCount = COUNT([MR].[ID])
FROM 
  [MatchupResults] [MR]
WHERE 
  [MR].[PlayerGUID] = @PlayerGUID

RETURN 
(
  SELECT @PickCount
)
END