Oracle PL/SQL/Insert Delete Update/DELETE WHERE

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Delete all records in TableA whose data in field1 and field2 DO NOT match the data in fieldx and fieldz of TableB

   <source lang="sql">

   DELETE FROM TableA
   WHERE NOT EXISTS
     ( select *
        from TableB
        where TableA .field1 = TableB.fieldx
        and TableA .field2 = TableB.fieldz );


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Delete clause with sub query

   <source lang="sql">

SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,

 2                    ENAME VARCHAR2(10),
 3                    JOB VARCHAR2(9),
 4                    MGR NUMBER(4),
 5                    HIREDATE DATE,
 6                    SAL NUMBER(7, 2),
 7                    COMM NUMBER(7, 2),
 8                    DEPTNO NUMBER(2));

SQL> SQL> INSERT INTO EMP VALUES (7369, "SMITH", "CLERK", 7902, TO_DATE("17-DEC-1980", "DD-MON-YYYY"), 800, NULL, 20); SQL> INSERT INTO EMP VALUES (7499, "ALLEN", "SALESMAN", 7698, TO_DATE("20-FEB-1981", "DD-MON-YYYY"), 1600, 300, 30); SQL> INSERT INTO EMP VALUES (7521, "WARD", "SALESMAN", 7698, TO_DATE("22-FEB-1981", "DD-MON-YYYY"), 1250, 500, 30); SQL> INSERT INTO EMP VALUES (7566, "JONES", "MANAGER", 7839, TO_DATE("2-APR-1981", "DD-MON-YYYY"), 2975, NULL, 20); SQL> INSERT INTO EMP VALUES (7654, "MARTIN", "SALESMAN", 7698,TO_DATE("28-SEP-1981", "DD-MON-YYYY"), 1250, 1400, 30); SQL> INSERT INTO EMP VALUES (7698, "BLAKE", "MANAGER", 7839,TO_DATE("1-MAY-1981", "DD-MON-YYYY"), 2850, NULL, 30); SQL> INSERT INTO EMP VALUES (7782, "CLARK", "MANAGER", 7839,TO_DATE("9-JUN-1981", "DD-MON-YYYY"), 2450, NULL, 10); SQL> INSERT INTO EMP VALUES (7788, "SCOTT", "ANALYST", 7566,TO_DATE("09-DEC-1982", "DD-MON-YYYY"), 3000, NULL, 20); SQL> INSERT INTO EMP VALUES (7839, "KING", "PRESIDENT", NULL,TO_DATE("17-NOV-1981", "DD-MON-YYYY"), 5000, NULL, 10); SQL> INSERT INTO EMP VALUES (7844, "TURNER", "SALESMAN", 7698,TO_DATE("8-SEP-1981", "DD-MON-YYYY"), 1500, 0, 30); SQL> INSERT INTO EMP VALUES (7876, "ADAMS", "CLERK", 7788,TO_DATE("12-JAN-1983", "DD-MON-YYYY"), 1100, NULL, 20); SQL> INSERT INTO EMP VALUES (7900, "JAMES", "CLERK", 7698,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 950, NULL, 30); SQL> INSERT INTO EMP VALUES (7902, "FORD", "ANALYST", 7566,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 3000, NULL, 20); SQL> INSERT INTO EMP VALUES (7934, "MILLER", "CLERK", 7782,TO_DATE("23-JAN-1982", "DD-MON-YYYY"), 1300, NULL, 10); SQL> SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) ); SQL> SQL> INSERT INTO DEPT VALUES (10, "ACCOUNTING", "NEW YORK"); SQL> INSERT INTO DEPT VALUES (20, "RESEARCH", "DALLAS"); SQL> INSERT INTO DEPT VALUES (30, "SALES", "CHICAGO"); SQL> INSERT INTO DEPT VALUES (40, "OPERATIONS", "BOSTON"); SQL> SQL> SQL> select * from emp;

    EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO

---------- --------- ---------- --------- ---------- ---------- ----------
     7369 SMITH      CLERK           7902 17-DEC-80        800                    20
     7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
     7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
     7566 JONES      MANAGER         7839 02-APR-81       2975                    20
     7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
     7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
     7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
     7788 SCOTT      ANALYST         7566 09-DEC-82       3000                    20
     7839 KING       PRESIDENT            17-NOV-81       5000                    10
     7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
     7876 ADAMS      CLERK           7788 12-JAN-83       1100                    20
    EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO

---------- --------- ---------- --------- ---------- ---------- ----------
     7900 JAMES      CLERK           7698 03-DEC-81        950                    30
     7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
     7934 MILLER     CLERK           7782 23-JAN-82       1300                    10

SQL> SQL> select * from dept;

   DEPTNO DNAME          LOC

-------------- -------------
       10 ACCOUNTING     NEW YORK
       20 RESEARCH       DALLAS
       30 SALES          CHICAGO
       40 OPERATIONS     BOSTON

SQL> SQL> SQL> DELETE FROM emp

 2      WHERE EXISTS
 3        ( select *
 4           from emp, dept
 5           where emp.deptno = dept.deptno);

SQL> SQL> SQL> select * from emp; SQL> SQL> SQL> drop table dept; SQL> drop table emp; SQL> SQL> SQL> SQL>


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Delete command with conditions

   <source lang="sql">

SQL> SQL> -- create demo table SQL> create table Employee(

 2    ID                 VARCHAR2(4 BYTE)         NOT NULL,
 3    First_Name         VARCHAR2(10 BYTE),
 4    Last_Name          VARCHAR2(10 BYTE),
 5    Start_Date         DATE,
 6    End_Date           DATE,
 7    Salary             Number(8,2),
 8    City               VARCHAR2(10 BYTE),
 9    Description        VARCHAR2(15 BYTE)
10  )
11  /

Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2               values ("01","Jason",    "Martin",  to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto",  "Programmer")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("02","Alison",   "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("03","James",    "Smith",   to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("04","Celia",    "Rice",    to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("05","Robert",   "Black",   to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("06","Linda",    "Green",   to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York",  "Tester")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("07","David",    "Larry",   to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York",  "Manager")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("08","James",    "Cat",     to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
 3  /

1 row created. SQL> SQL> SQL> SQL> -- display data in the table SQL> select * from Employee

 2  /

ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION


---------- ---------- --------- --------- ---------- ---------- ---------------

01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION


---------- ---------- --------- --------- ---------- ---------- ---------------

08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected. SQL> SQL> SQL> SQL> SQL> SQL> SQL> -- delete command with conditions SQL> SQL> delete from Employee where Salary > 3000; 4 rows deleted. SQL> SQL> select * from Employee; ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION


---------- ---------- --------- --------- ---------- ---------- ---------------

01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 4 rows selected. SQL> SQL> SQL> SQL> -- clean the table SQL> drop table Employee

 2  /

Table dropped. SQL> SQL> SQL>


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Delete one row

   <source lang="sql">
 

SQL> SQL> CREATE TABLE project (

 2    pro_id              NUMBER(4),
 3    pro_name            VARCHAR2(40),
 4    budget          NUMBER(9,2),
 5    CONSTRAINT project_pk   PRIMARY KEY (pro_id)
 6  );

Table created. SQL> SQL> SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1001, "A",1912000); 1 row created. SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1002, "ERP",9999999); 1 row created. SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1003, "SQL",897000); 1 row created. SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1004, "CRM",294000); 1 row created. SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1005, "VPN",415000); 1 row created. SQL> SQL> SQL> SET ECHO ON SQL> DELETE

 2  FROM project
 3  WHERE pro_id = 1006
 4

SQL> SQL> SQL> SQL> SQL> drop table project; Table dropped.


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Delete statement with where clause and varchar2 type column

   <source lang="sql">
 

SQL> SQL> CREATE TABLE employees

 2  ( employee_id          number(10)      not null,
 3    last_name            varchar2(50)      not null,
 4    email                varchar2(30),
 5    hire_date            date,
 6    job_id               varchar2(30),
 7    department_id        number(10),
 8    salary               number(6),
 9    manager_id           number(6)
10  );

Table created. SQL> SQL> SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary,department_id ,manager_id)

 2                values ( 1001, "Lawson", "lawson@g.ru", "01-JAN-2002","MGR", 30000,1 ,1004);

1 row created. SQL> SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id ,manager_id)

 2                values ( 1002, "Wells", "wells@g.ru", "01-JAN-2002", "DBA", 20000,2, 1005 );

1 row created. SQL> SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id ,manager_id)

 2                 values( 1003, "Bliss", "bliss@g.ru", "01-JAN-2002", "PROG", 24000,3 ,1004);

1 row created. SQL> SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id, manager_id)

 2                 values( 1004,  "Kyte", "YourName@a.ru", SYSDATE-3650, "MGR",25000 ,4, 1005);

1 row created. SQL> SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id, manager_id)

 2                 values( 1005, "Dillon", "sdillon@a .ru", SYSDATE, "PROG", 20000, 1, 1006);

1 row created. SQL> SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id,manager_id)

 2                 values( 1006, "Beck", "clbeck@g.ru", SYSDATE, "PROG", 20000, 2, null);

1 row created. SQL> SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id, manager_id)

 2                 values( 1007, "Java", "java01@g.ru", SYSDATE, "PROG", 20000, 3, 1006);

1 row created. SQL> SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id, manager_id)

 2                 values( 1008, "Oracle", "oracle1@g.ru", SYSDATE, "DBA", 20000, 4, 1006);

1 row created. SQL> SQL> select * from employees; EMPLOYEE_ID LAST_NAME EMAIL HIRE_DATE JOB_ID DEPARTMENT_ID SALARY MANAGER_ID


-------------------------------------------------- ------------------------------ --------- ------------------------------ ------------- ---------- ----------
      1001 Lawson                                             lawson@g.ru                   01-JAN-02 MGR                                        1      30000       1004
      1002 Wells                                              wells@g.ru                    01-JAN-02 DBA                                        2      20000       1005
      1003 Bliss                                              bliss@g.ru                    01-JAN-02 PROG                                       3      24000       1004
      1004 Kyte                                               YourName@a.ru                 13-JUN-98 MGR                                        4      25000       1005
      1005 Dillon                                             sdillon@a .ru                 10-JUN-08 PROG                                       1      20000       1006
      1006 Beck                                               clbeck@g.ru                   10-JUN-08 PROG                                       2      20000
      1007 Java                                               java01@g.ru                   10-JUN-08 PROG                                       3      20000       1006

EMPLOYEE_ID LAST_NAME EMAIL HIRE_DATE JOB_ID DEPARTMENT_ID SALARY MANAGER_ID


-------------------------------------------------- ------------------------------ --------- ------------------------------ ------------- ---------- ----------
      1008 Oracle                                             oracle1@g.ru                  10-JUN-08 DBA                                        4      20000       1006

8 rows selected. SQL> SQL> delete

 2  from employees
 3  where job_id = "DBA";

2 rows deleted. SQL> SQL> SQL> select * from employees; EMPLOYEE_ID LAST_NAME EMAIL HIRE_DATE JOB_ID DEPARTMENT_ID SALARY MANAGER_ID


-------------------------------------------------- ------------------------------ --------- ------------------------------ ------------- ---------- ----------
      1001 Lawson                                             lawson@g.ru                   01-JAN-02 MGR                                        1      30000       1004
      1003 Bliss                                              bliss@g.ru                    01-JAN-02 PROG                                       3      24000       1004
      1004 Kyte                                               YourName@a.ru                 13-JUN-98 MGR                                        4      25000       1005
      1005 Dillon                                             sdillon@a .ru                 10-JUN-08 PROG                                       1      20000       1006
      1006 Beck                                               clbeck@g.ru                   10-JUN-08 PROG                                       2      20000
      1007 Java                                               java01@g.ru                   10-JUN-08 PROG                                       3      20000       1006

6 rows selected. SQL> SQL> SQL> drop table employees; Table dropped.

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WHERE clause is used to control which rows are affected by the DELETE statement

   <source lang="sql">

SQL> -- create demo table SQL> create table Employee(

 2    ID                 VARCHAR2(4 BYTE)         NOT NULL,
 3    First_Name         VARCHAR2(10 BYTE),
 4    Last_Name          VARCHAR2(10 BYTE),
 5    Start_Date         DATE,
 6    End_Date           DATE,
 7    Salary             Number(8,2),
 8    City               VARCHAR2(10 BYTE),
 9    Description        VARCHAR2(15 BYTE)
10  )
11  /

Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2               values ("01","Jason",    "Martin",  to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto",  "Programmer")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("02","Alison",   "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("03","James",    "Smith",   to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("04","Celia",    "Rice",    to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("05","Robert",   "Black",   to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("06","Linda",    "Green",   to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York",  "Tester")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("07","David",    "Larry",   to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York",  "Manager")
 3  /

1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)

 2                values("08","James",    "Cat",     to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
 3  /

1 row created. SQL> SQL> SQL> SQL> -- display data in the table SQL> select * from Employee

 2  /

ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION


---------- ---------- --------- --------- ---------- ---------- ---------------

01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected. SQL> SQL> --WHERE clause is used to control which rows are affected by the DELETE statement. SQL> SQL> SQL> DELETE FROM Employee

 2  WHERE ID = "04";

1 row deleted. SQL> SQL> select * from employee; ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION


---------- ---------- --------- --------- ---------- ---------- ---------------

01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 7 rows selected. SQL> SQL> -- clean the table SQL> drop table Employee

 2  /

Table dropped. SQL> SQL>


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