将下面这些写进一个查询，不太会请指导一下
SELECT SUM(`A`) AS A0 , `B` FROM `table` WHERE conditon1,
SELECT SUM(`A`) AS A1 , `B` FROM `table` WHERE conditon2,
SELECT SUM(`A`) AS A2 , `B` FROM `table` WHERE conditon3,
GROUP BY `B`";

最后想得到的结果：

B1 A0 A1 A2
B2 A0 A1 A2
B3 A0 A1 A2
..........