如何使用sql server进行BEFORE UPDATED触发器？

CREATE TRIGGER tr_BeforeUpdate
ON YourTable
INSTEAD OF UPDATE
AS
BEGIN
    -- 在此处添加您的逻辑
END

CREATE TRIGGER tr_BeforeUpdate
ON YourTable
INSTEAD OF UPDATE
AS
BEGIN
    DECLARE @OldValue INT
    DECLARE @NewValue INT

    SELECT @OldValue = [ColumnName] FROM deleted
    SELECT @NewValue = [ColumnName] FROM inserted
END

CREATE TRIGGER tr_BeforeUpdate
ON YourTable
INSTEAD OF UPDATE
AS
BEGIN
    DECLARE @OldValue INT
    DECLARE @NewValue INT

    SELECT @OldValue = [ColumnName] FROM deleted
    SELECT @NewValue = [ColumnName] FROM inserted

    IF @NewValue > 100
    BEGIN
        RAISERROR('New value must be less than or equal to 100', 16, 1)
        RETURN
    END

    UPDATE YourTable
    SET [ColumnName] = @NewValue
    WHERE [PrimaryKeyColumn] = (SELECT [PrimaryKeyColumn] FROM inserted)
END