db2 行列互换示例

SQL:
SELECT b.matnr, b.a1, b.a2, b.a3
  FROM (SELECT a.MATNR,
               max (CASE WHEN ausp1 = '装载机' THEN 1 ELSE -1 END) a1,
               max (CASE WHEN ausp1 = '标配驾驶室' THEN 1 ELSE -1 END)
                  a2,
               max (CASE WHEN ausp1 = '机械' THEN 1 ELSE -1 END) a3
          FROM ZD_ZAUSP a
        GROUP BY a.MATNR) b
WHERE b.a1 = 1 AND b.a2 = 1 AND b.a3 = 1

EQ

select distinct a.* from
ZD_ZAUSP a,ZD_ZAUSP b,ZD_ZAUSP c
where a.AUSP1 = '装载机' and b.AUSP1 = '机械' and c.AUSP1 = '标配驾驶室'
and a.MATNR = b.MATNR and a.MATNR = c.MATNR

但是后者扩展受限
逆向: Union