Oracle PL/SQL/Table/Merge
Содержание
Merge table into another table
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.
Merge two tables and map columns
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>
Merge two tables when matched or not matched
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>
Merge two tables with update
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>