存储过程T-SQL中的递增/递减

Question

我有一个包含以下字段的表格：

ID , FirstName , LastName , Count , Amount

需要类似这样的代码：

IF EXISTS (SELECT * FROM [myDB] WHERE @ID = [ID])
set [count] = [count] + 1 and [Amount] = [Amount] - 1

Answer 1

使用这样的简单更新查询：

UPDATE myDB
SET [count] = [count] + 1
, [Amount] = [Amount] - 1
WHERE ID = @ID

请参阅this SQLFiddle

Answer 2

更新MST_SPR_donategifts     SET Gift_Quantity = Gift_Quantity- @Gift_Quantity     在哪里Gift_Code = @ Gift_Code