Oracle SQL - Using Update statement with subquery to change two columns

Introduction

The third example uses a subquery to determine the value of deptno and mgr.

Instead of having two different subqueries for deptno and mgr, you can use a scalar subquery that returns multiple columns.

The number, data types, and order of the subquery columns must match the columns that are being updated.

Demo

SQL>
SQL>-- from  www  .  j  a v a2  s .c o  m
SQL> drop table emp;

Table dropped.

SQL> create table emp(
  2  empno      NUMBER(4)    primary key,
  3  ename      VARCHAR2(8)  not null   ,
  4  init       VARCHAR2(5)  not null   ,
  5  job        VARCHAR2(8)             ,
  6  mgr        NUMBER(4)               ,
  7  bdate      DATE         not null   ,
  8  msal       NUMBER(6,2)  not null   ,
  9  comm       NUMBER(6,2)             ,
 10  deptno     NUMBER(2)    default 10) ;
SQL>
SQL> insert into emp values(7001,'SMITH','N',  'TRAINER', 7902,date '1975-12-17',  1800 , NULL, 20);
SQL> insert into emp values(7002,'ALLEN','JAM','SALESREP',7006,date '1971-05-20',  1600, 300,   30);
SQL> insert into emp values(7003,'WARD', 'TF' ,'SALESREP',7006,date '1972-03-02',  1250, 500,   10);
SQL> insert into emp values(7004,'JACK', 'JM', 'MANAGER', 7009,date '1977-04-02',  2975, NULL,  20);
SQL> insert into emp values(7005,'BROWN','P',  'SALESREP',7006,date '1976-09-28',  1250, 1400,  30);
SQL> insert into emp values(7006,'BLAKE','R',  'MANAGER', 7009,date '1973-11-01',  2850, NULL,  10);
SQL> insert into emp values(7007,'CLARK','AB', 'MANAGER', 7009,date '1975-06-09',  2450, NULL,  10);
SQL> insert into emp values(7008,'SCOTT','DEF','TRAINER', 7004,date '1979-11-26',  3000, NULL,  20);
SQL> insert into emp values(7009,'KING', 'CC', 'DIRECTOR',NULL,date '1972-10-17',  5000, NULL,  10);
SQL> insert into emp values(7010,'BREAD','JJ', 'SALESREP',7006,date '1978-09-28',  1500, 0,     30);
SQL> insert into emp values(7011,'ADAMS','AA', 'TRAINER', 7008,date '1976-12-30',  1100, NULL,  20);
SQL> insert into emp values(7012,'JONES','R',  'ADMIN',   7006,date '1979-10-03',  8000, NULL,  30);
SQL> insert into emp values(7902,'FORD', 'MG', 'TRAINER', 7004,date '1979-02-13',  3000, NULL,  20);
SQL> insert into emp values(7934,'MARY', 'ABC','ADMIN',   7007,date '1972-01-23',  1300, NULL,  10);
SQL>
SQL> UPDATE emp
  2  SET (deptno,mgr) = (SELECT deptno,mgr
  3                      FROM   departments
  4                      WHERE  location = 'BOSTON')
  5  WHERE empno = 7012;

1 row updated.

SQL>
SQL> select *
  2  from emp;

    EMPNO | ENAME    | INIT  | JOB      |       MGR | BDATE      |      MSAL
--------- | -------- | ----- | -------- | --------- | ---------- | ---------
     COMM |    DEPTNO
--------- | ---------
 07001.00 | SMITH    | N     | TRAINER  |  07902.00 | 17-12-1975 |  01800.00
 [N/A]    |  00020.00

 07002.00 | ALLEN    | JAM   | SALESREP |  07006.00 | 20-05-1971 |  01600.00
 00300.00 |  00030.00

 07003.00 | WARD     | TF    | SALESREP |  07006.00 | 02-03-1972 |  01250.00
 00500.00 |  00010.00


    EMPNO | ENAME    | INIT  | JOB      |       MGR | BDATE      |      MSAL
--------- | -------- | ----- | -------- | --------- | ---------- | ---------
     COMM |    DEPTNO
--------- | ---------
 07004.00 | JACK     | JM    | MANAGER  |  07009.00 | 02-04-1977 |  02975.00
 [N/A]    |  00020.00

 07005.00 | BROWN    | P     | SALESREP |  07006.00 | 28-09-1976 |  01250.00
 01400.00 |  00030.00

 07006.00 | BLAKE    | R     | MANAGER  |  07009.00 | 01-11-1973 |  02850.00
 [N/A]    |  00010.00


    EMPNO | ENAME    | INIT  | JOB      |       MGR | BDATE      |      MSAL
--------- | -------- | ----- | -------- | --------- | ---------- | ---------
     COMM |    DEPTNO
--------- | ---------
 07007.00 | CLARK    | AB    | MANAGER  |  07009.00 | 09-06-1975 |  02450.00
 [N/A]    |  00010.00

 07008.00 | SCOTT    | DEF   | TRAINER  |  07004.00 | 26-11-1979 |  03000.00
 [N/A]    |  00020.00

 07009.00 | KING     | CC    | DIRECTOR |  [N/A]    | 17-10-1972 |  05000.00
 [N/A]    |  00010.00


    EMPNO | ENAME    | INIT  | JOB      |       MGR | BDATE      |      MSAL
--------- | -------- | ----- | -------- | --------- | ---------- | ---------
     COMM |    DEPTNO
--------- | ---------
 07010.00 | BREAD    | JJ    | SALESREP |  07006.00 | 28-09-1978 |  01500.00
 00000.00 |  00030.00

 07011.00 | ADAMS    | AA    | TRAINER  |  07008.00 | 30-12-1976 |  01100.00
 [N/A]    |  00020.00

 07012.00 | JONES    | R     | ADMIN    |  07009.00 | 03-10-1979 |  08000.00
 [N/A]    |  00040.00


    EMPNO | ENAME    | INIT  | JOB      |       MGR | BDATE      |      MSAL
--------- | -------- | ----- | -------- | --------- | ---------- | ---------
     COMM |    DEPTNO
--------- | ---------
 07902.00 | FORD     | MG    | TRAINER  |  07004.00 | 13-02-1979 |  03000.00
 [N/A]    |  00020.00

 07934.00 | MARY     | ABC   | ADMIN    |  07007.00 | 23-01-1972 |  01300.00
 [N/A]    |  00010.00


14 rows selected.

SQL>

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