?????SQL??MaxCompute??????????????
???????????? ???????[ 2016/12/22 14:19:41 ] ????????SQL Server ?????
????MaxCompute SQL???????????Update??Delete?????????????????п????????Щ??????????????????????????????MaxCompute SQL??Insert?????Insert Into/Overwrite????????????????????????????????д??????д??????????????д???????????????д??????????????д??????????????????????????????????μ????????????????????????????????????????????д??????????????????μ??????????????????
????Update
???????????????????????Insert Overwrite???????????Update??????????Update?????????Update???????????Update??????????????????????Update?????Select?????????Insert Overwrite????????????Update????????????ü?????????????????·??????
????--?????
+------------+------------+------------+------------+------------+------------+------------+------------+
| empno | ename | job | mgr | hiredate | sal | comm | deptno |
+------------+------------+------------+------------+------------+------------+------------+------------+
| 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 00:00:00 | 1600.0 | 300.0 | 30 |
| 7521 | WARD | SALESMAN | 7698 | 1981-02-22 00:00:00 | 1250.0 | 500.0 | 30 |
| 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 00:00:00 | 1250.0 | 1400.0 | 30 |
| 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 00:00:00 | 2850.0 | NULL | 30 |
| 7782 | CLARK | MANAGER | 7839 | 1981-06-09 00:00:00 | 2450.0 | NULL | 10 |
| 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 00:00:00 | 1500.0 | 0.0 | 30 |
| 7900 | JAMES | CLERK | 7698 | 1981-12-03 00:00:00 | 950.0 | NULL | 30 |
| 7902 | FORD | ANALYST | 7566 | 1981-12-03 00:00:00 | 3000.0 | NULL | 20 |
| 7788 | SCOTT | ANALYST | 7566 | 1987-07-13 01:00:00 | 3000.0 | NULL | 20 |
| 7876 | ADAMS | CLERK | 7788 | 1987-07-13 01:00:00 | 1100.0 | NULL | 20 |
+------------+------------+------------+------------+------------+------------+------------+------------+
????--?SQL
????Update Table emp Set comm = 0 where comm is null;
????--??SQL
????--????????и????????coalesce?????????????case when??????????
Insert Overwrite table emp Select empno??ename?? job??mgr??hiredate??sal??case when comm is null then 0.0 else comm end as comm??deptno from emp;
+------------+------------+------------+------------+------------+------------+------------+------------+
| empno | ename | job | mgr | hiredate | sal | comm | deptno |
+------------+------------+------------+------------+------------+------------+------------+------------+
| 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 00:00:00 | 2850.0 | 0.0 | 30 |
| 7788 | SCOTT | ANALYST | 7566 | 1987-07-13 01:00:00 | 3000.0 | 0.0 | 20 |
| 7782 | CLARK | MANAGER | 7839 | 1981-06-09 00:00:00 | 2450.0 | 0.0 | 10 |
| 7902 | FORD | ANALYST | 7566 | 1981-12-03 00:00:00 | 3000.0 | 0.0 | 20 |
| 7876 | ADAMS | CLERK | 7788 | 1987-07-13 01:00:00 | 1100.0 | 0.0 | 20 |
| 7900 | JAMES | CLERK | 7698 | 1981-12-03 00:00:00 | 950.0 | 0.0 | 30 |
| 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 00:00:00 | 1600.0 | 300.0 | 30 |
| 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 00:00:00 | 1250.0 | 1400.0 | 30 |
| 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 00:00:00 | 1500.0 | 0.0 | 30 |
| 7521 | WARD | SALESMAN | 7698 | 1981-02-22 00:00:00 | 1250.0 | 500.0 | 30 |
+------------+------------+------------+------------+------------+------------+------------+------------+
????????????????????????????????????÷??????Insert????Select????????????????????????????
????Delete
????Delete????????????????????????????????????????????????????????????
??????????????
??????????????????????????? TRUNCATE TABLE table_name; ??????????????????
????????????????????????????????? ALTER TABLE table_name DROP PARTITION; ???????????????????????????????????????(????????????????????????)??
odps@ aliyun2014>show partitions partition_table;
ds=20160101
ds=20160102
OK
odps@ aliyun2014>alter table partition_table drop if exists partition(ds='20160102');
Confirm to "alter table partition_table drop if exists partition(ds='20160102');" (yes/no)? yes
OK
>show partitions partition_table;
ds=20160101
OK
???????????????
??????????????????????where?????????????????????????Delete?????Insert Overwrite?????????????????????????????????????д????μ??????????????????????????????д??????????????????????????????Update???????????????????????Insert???????????????????????????????????
????--????????????????Update????emp???в???
????--?SQL ???????????job?SALESMAN????
????Delete from emp where comm >500;
????--??SQL???????????????Щ??????????????Union all
????Insert Overwrite Table Emp Select * From Emp Where comm <=500 or comm is null;
????--?????
+------------+------------+------------+------------+------------+------------+------------+------------+
| empno | ename | job | mgr | hiredate | sal | comm | deptno |
+------------+------------+------------+------------+------------+------------+------------+------------+
| 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 00:00:00 | 2850.0 | NULL | 30 |
| 7788 | SCOTT | ANALYST | 7566 | 1987-07-13 01:00:00 | 3000.0 | NULL | 20 |
| 7782 | CLARK | MANAGER | 7839 | 1981-06-09 00:00:00 | 2450.0 | NULL | 10 |
| 7902 | FORD | ANALYST | 7566 | 1981-12-03 00:00:00 | 3000.0 | NULL | 20 |
| 7876 | ADAMS | CLERK | 7788 | 1987-07-13 01:00:00 | 1100.0 | NULL | 20 |
| 7900 | JAMES | CLERK | 7698 | 1981-12-03 00:00:00 | 950.0 | NULL | 30 |
| 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 00:00:00 | 1600.0 | 300.0 | 30 |
| 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 00:00:00 | 1500.0 | 0.0 | 30 |
| 7521 | WARD | SALESMAN | 7698 | 1981-02-22 00:00:00 | 1250.0 | 500.0 | 30 |
+------------+------------+------------+------------+------------+------------+------------+------------+
??????????????Щ????????????????????????Щ???????С???ɡ??????ЩС????????????????ù???????????Ч???
????????????????????????????????????????????????????????????????????????????????μ?????????????????д???μ???д??????????????????????????????????????????????
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