數據統計--union all 執行多條sql
阿新 • • 發佈:2019-03-05
name HERE spa nbsp 執行 通過 code ble clas
需求--統計hive某張表type字段不同取值的數據量
我們已知某張表的type的取值是1,2,3,4,5,想要統計不同type的數據量,並清晰的展現出來。可以通過union all 的方式,sql如下:
SELECT "1",COUNT(*) FROM table_name WHERE type = "1" UNION ALL SELECT "2",COUNT(*) FROM table_name WHERE type = "2" UNION ALL SELECT "3",COUNT(*) FROM table_name WHERE type = "3" UNION ALL SELECT"4",COUNT(*) FROM table_name WHERE type = "4" UNION ALL SELECT "5",COUNT(*) FROM table_name WHERE type = "5"
得到的結果如下:
type | count(*) |
1 | 324 |
2 | 123 |
3 | 345 |
4 | 156 |
5 | 343 |
數據統計--union all 執行多條sql