Oracle PL/SQL/Table/Merge

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Merge table into another table

   <source lang="sql">

SQL> create table student_emails_ext

 2   (firstname    varchar(40),
 3    lastname     varchar(40),
 4    email        varchar(80) );

Table created. SQL> SQL> create table student_emails

 2  as select * from student_emails_ext
 3     where 0=1
 4  /

Table created. SQL> SQL> SQL> merge into student_emails s

 2  using (select * from student_emails_ext) e
 3  on (s.firstname = e.firstname and s.lastname = e.lastname)
 4  when matched then
 5       update set s.email = e.email
 6  when not matched then
 7       insert (s.firstname, s.lastname, s.email)
 8       values(e.firstname , e.lastname, e.email);

0 rows merged. SQL> SQL> drop table student_emails_ext; Table dropped. SQL> drop table student_emails; Table dropped.

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Merge two tables and map columns

   <source lang="sql">

SQL> SQL> -- create demo table SQL> create table emp(

 2    ID                 VARCHAR2(4 BYTE)         NOT NULL,
 3    fname         VARCHAR2(10 BYTE),
 4    lname          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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp

 2  /

ID FNAME LNAME 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

ID FNAME LNAME START_DAT END_DATE SALARY CITY


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

DESCRIPTION


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

ID FNAME LNAME START_DAT END_DATE SALARY CITY


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

DESCRIPTION


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> SQL> create table new_emp as select * from emp; Table created. SQL> SQL> update new_emp set salary = salary +1; 8 rows updated. SQL> update new_emp set id = id +1; 8 rows updated. SQL> SQL> select * from new_emp; ID FNAME LNAME START_DAT END_DATE SALARY CITY


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

DESCRIPTION


2 Jason Martin 25-JUL-96 25-JUL-06 1235.56 Toronto Programmer 3 Alison Mathews 21-MAR-76 21-FEB-86 6662.78 Vancouver Tester 4 James Smith 12-DEC-78 15-MAR-90 6545.78 Vancouver Tester

ID FNAME LNAME START_DAT END_DATE SALARY CITY


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

DESCRIPTION


5 Celia Rice 24-OCT-82 21-APR-99 2345.78 Vancouver Manager 6 Robert Black 15-JAN-84 08-AUG-98 2335.78 Vancouver Tester 7 Linda Green 30-JUL-87 04-JAN-96 4323.78 New York Tester

ID FNAME LNAME START_DAT END_DATE SALARY CITY


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

DESCRIPTION


8 David Larry 31-DEC-90 12-FEB-98 7898.78 New York Manager 9 James Cat 17-SEP-96 15-APR-02 1233.78 Vancouver Tester

8 rows selected. SQL> SQL> --Merging Rows Using MERGE SQL> --merge rows from one table into another SQL> SQL> MERGE INTO emp e

 2  USING new_emp ne ON (e.id = ne.id)
 3  WHEN NOT MATCHED THEN
 4  INSERT (e.id, e.fname, e.lname, e.description, e.salary)VALUES(ne.id,ne.fna

me,ne.lname,ne.description,ne.salary); 8 rows merged. SQL> SQL> -- clean the table SQL> drop table new_emp; Table dropped. SQL> drop table emp

 2  /

Table dropped. SQL> SQL>

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Merge two tables when matched or not matched

   <source lang="sql">

SQL> SQL> SQL> create table myTable(pid number, sales number, status varchar2(6)); Table created. SQL> create table master_tab(pid number, sales number, status varchar2(6)); Table created. SQL> SQL> insert into master_tab values(1,12,"CURR"); 1 row created. SQL> insert into master_tab values(2,13,"NEW" ); 1 row created. SQL> insert into master_tab values(3,15,"CURR"); 1 row created. SQL> SQL> insert into myTable values(2,24,"CURR"); 1 row created. SQL> insert into myTable values(3, 0,"OBS" ); 1 row created. SQL> insert into myTable values(4,42,"CURR"); 1 row created. SQL> SQL> SQL> merge into master_tab m

 2        using myTable d
 3        on (m.pid = d.pid)
 4  when  matched
 5  then  update set   m.sales  = m.sales+d.sales
 6               ,     m.status = d.status
 7        delete where m.status = "OBS"
 8  when  not matched
 9  then  insert values (d.pid,d.sales,"NEW");

3 rows merged. SQL> SQL> select * from master_tab;

      PID      SALES STATUS

---------- ------
        1         12 CURR
        2         37
        4         42 NEW

SQL> SQL> SQL> SQL> drop table myTable; Table dropped. SQL> drop table master_tab; Table dropped. SQL>

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Merge two tables with update

   <source lang="sql">

SQL> SQL> -- create demo table SQL> create table emp(

 2    ID                 VARCHAR2(4 BYTE)         NOT NULL,
 3    fname         VARCHAR2(10 BYTE),
 4    lname          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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp(ID, fname, lname, 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 emp

 2  /

ID FNAME LNAME 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

ID FNAME LNAME START_DAT END_DATE SALARY CITY


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

DESCRIPTION


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

ID FNAME LNAME START_DAT END_DATE SALARY CITY


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

DESCRIPTION


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> SQL> create table new_emp as select * from emp; Table created. SQL> SQL> update new_emp set salary = salary +1; 8 rows updated. SQL> SQL> select * from new_emp; ID FNAME LNAME START_DAT END_DATE SALARY CITY


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

DESCRIPTION


01 Jason Martin 25-JUL-96 25-JUL-06 1235.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6662.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6545.78 Vancouver Tester

ID FNAME LNAME START_DAT END_DATE SALARY CITY


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

DESCRIPTION


04 Celia Rice 24-OCT-82 21-APR-99 2345.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2335.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4323.78 New York Tester

ID FNAME LNAME START_DAT END_DATE SALARY CITY


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

DESCRIPTION


07 David Larry 31-DEC-90 12-FEB-98 7898.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1233.78 Vancouver Tester

8 rows selected. SQL> SQL> --Merging Rows Using MERGE SQL> --merge rows from one table into another SQL> SQL> MERGE INTO emp e

 2  USING new_emp ne ON (e.id = ne.id)
 3  WHEN MATCHED THEN UPDATE SET e.salary = ne.salary;

8 rows merged. SQL> SQL> SQL> -- clean the table SQL> drop table new_emp; Table dropped. SQL> drop table emp

 2  /

Table dropped. SQL>

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