в 13:45, 26 мая 2010

2010-05-26T13:45:19Z

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2010-05-26T10:00:29Z

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==With statement and subquery==



<source lang="sql">

SQL>
SQL> create table emp
2 ( empno NUMBER(4) constraint E_PK primary key
3 , ename VARCHAR2(8)
4 , init VARCHAR2(5)
5 , job VARCHAR2(8)
6 , mgr NUMBER(4)
7 , bdate DATE
8 , sal NUMBER(6,2)
9 , comm NUMBER(6,2)
10 , deptno NUMBER(2) default 10
11 ) ;
Table created.
SQL> insert into emp values(1,"Tom","N", "TRAINER", 13,date "1965-12-17", 800 , NULL, 20);
1 row created.
SQL> insert into emp values(2,"Jack","JAM", "Tester",6,date "1961-02-20", 1600, 300, 30);
1 row created.
SQL> insert into emp values(3,"Wil","TF" , "Tester",6,date "1962-02-22", 1250, 500, 30);
1 row created.
SQL> insert into emp values(4,"Jane","JM", "Designer", 9,date "1967-04-02", 2975, NULL, 20);
1 row created.
SQL> insert into emp values(5,"Mary","P", "Tester",6,date "1956-09-28", 1250, 1400, 30);
1 row created.
SQL> insert into emp values(6,"Black","R", "Designer", 9,date "1963-11-01", 2850, NULL, 30);
1 row created.
SQL> insert into emp values(7,"Chris","AB", "Designer", 9,date "1965-06-09", 2450, NULL, 10);
1 row created.
SQL> insert into emp values(8,"Smart","SCJ", "TRAINER", 4,date "1959-11-26", 3000, NULL, 20);
1 row created.
SQL> insert into emp values(9,"Peter","CC", "Designer",NULL,date "1952-11-17", 5000, NULL, 10);
1 row created.
SQL> insert into emp values(10,"Take","JJ", "Tester",6,date "1968-09-28", 1500, 0, 30);
1 row created.
SQL> insert into emp values(11,"Ana","AA", "TRAINER", 8,date "1966-12-30", 1100, NULL, 20);
1 row created.
SQL> insert into emp values(12,"Jane","R", "Manager", 6,date "1969-12-03", 800 , NULL, 30);
1 row created.
SQL> insert into emp values(13,"Fake","MG", "TRAINER", 4,date "1959-02-13", 3000, NULL, 20);
1 row created.
SQL> insert into emp values(14,"Mike","TJA","Manager", 7,date "1962-01-23", 1300, NULL, 10);
1 row created.
SQL>
SQL> with g as
2 (select x.deptno
3 , avg(x.sal) avg_sal
4 from emp x
5 group by x.deptno)
6 select e.ename, e.init, e.sal
7 from emp e
8 join g
9 using (deptno)
10 where e.sal > g.avg_sal;
ENAME INIT SAL
-------- ----- ----------
Peter CC 5000
Jane JM 2975
Fake MG 3000
Smart SCJ 3000
Jack JAM 1600
Black R 2850
6 rows selected.
SQL>
SQL>
SQL> drop table emp;
Table dropped.
SQL>

</source>

==With the simple CASE statement, you can add many more WHEN blocks==



<source lang="sql">

SQL>
SQL> BEGIN
2 CASE
3 WHEN 1 = 2 THEN
4 dbms_output.put_line("Case [1 = 2]");
5 WHEN 2 = 2 THEN
6 dbms_output.put_line("Case [2 = 2]");
7 ELSE
8 dbms_output.put_line("No match");
9 END CASE;
10 END;
11 /
Case [2 = 2]
PL/SQL procedure successfully completed.

</source>

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в 13:45, 26 мая 2010

Admin: 1 версия