TSQL – 如果记录存在于单个选择中,则将查询中的值分配给变量

我如何改进以下代码只使用一次“选择”？

IF EXISTS (SELECT [NUMBER] FROM [TABLE] WHERE [ID_RECORD] = @id_record
BEGIN
   DECLARE @tmp_variable
   SELECT @tmp_variable = [NUMBER] FROM [TABLE] WHERE [ID_RECORD] = @id_record

   SET @other_variable = @tmp_variable
END
ELSE
BEGIN
   SET @other_variable = 0
END

解决方法

DECLARE @tmp_variable INT
 SET @tmp_variable = ISNULL(( SELECT    [NUMBER]
                              FROM      [TABLE]
                              WHERE     [ID_RECORD] = @id_record
                             ),0)

（编辑：天瑞地安资讯网_瑞安站长网）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!