按行统计符合条件的列数

数据库环境：SQL SERVER 2005　　

　　有数据如图1，要求：统计每行中有多少列的值在20以内，有多少列大于20。在原表的基础上

新增2列显示，实现的结果如图2。

　　按行统计符合条件的列数

　　如果直接在原表的基础上对列进行统计，会比较麻烦，可以通过列转行生成数据集1，再对1进行

分组统计得到结果集2，然后将原表和数据集2左联接，即可实现要求。

　　0.数据准备

WITH    x0
          AS ( SELECT   1 AS id ,
                        2 AS one ,
                        8 AS two ,
                        13 AS three ,
                        15 AS four
               UNION ALL
               SELECT   2 AS id ,
                        9 AS one ,
                        11 AS two ,
                        25 AS three ,
                        36 AS four
               UNION ALL
               SELECT   3 AS id ,
                        3 AS one ,
                        4 AS two ,
                        5 AS three ,
                        9 AS four
               UNION ALL
               SELECT   4 AS id ,
                        8 AS one ,
                        13 AS two ,
                        40 AS three ,
                        42 AS four
               UNION ALL
               SELECT   5 AS id ,
                        1 AS one ,
                        3 AS two ,
                        9 AS three ,
                        21 AS four
             )

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