I understand MONTHS_BETWEEN database function will work.
Friday, July 26, 2013
Sunday, April 28, 2013
How to start Application Express
After installing Oracle Express, point your web browser to http://localhost:8080/apex
To change the default port:
To change the default port:
sqlplus /nolog
connect sys/mypassword as sysdba
exec dbms_xdb.sethttpport('9090');
Oracle How to pivot a table
create table winners
(year varchar(4) not null,
team varchar(30) not null,
constraint pk_winners primary key (year));
insert into winners (year,team) values ('1990','SAINTS');
insert into winners (year,team) values ('1991','SWANS');
insert into winners (year,team) values ('1992','DOGS');
insert into winners (year,team) values ('1993','MAGPIES');
insert into winners (year,team) values ('1994','TIGERS');
SQL> select * from winners;
YEAR TEAM
---- ------------------------------
1990 SAINTS
1991 SWANS
1992 DOGS
1993 MAGPIES
1994 TIGERS
5 rows selected.
SQL> select max(decode(year,'1990',team,'')) as "1990",
max(decode(year,'1991',team,'')) as "1991",
max(decode(year,'1992',team,'')) as "1992",
max(decode(year,'1993',team,'')) as "1993",
max(decode(year,'1994',team,'')) as "1994"
from winners
1990 1991 1992 1993 1994
---------- ---------- ---------- ---------- ----------
SAINTS SWANS DOGS MAGPIES TIGERS
1 row selected.
Oracle:How to get first and last rows in an aggregation
create table transactions (
id integer not null,
tdate date not null,
opening_bal number(8,2) not null,
closing_bal number(8,2) not null,
transaction number(8,2) not null,
constraint pk_transactions primary key (id,tdate));
insert into transactions (id,tdate,opening_bal,closing_bal,transaction) values (1,'01-jan-10',0,10,10);
insert into transactions (id,tdate,opening_bal,closing_bal,transaction) values (1,'02-jan-10',10,20,10);
insert into transactions (id,tdate,opening_bal,closing_bal,transaction) values (1,'03-jan-10',20,25,5);
insert into transactions (id,tdate,opening_bal,closing_bal,transaction) values (1,'04-jan-10',25,-15,-40);
insert into transactions (id,tdate,opening_bal,closing_bal,transaction) values (1,'05-jan-10',-15,0,15);
insert into transactions (id,tdate,opening_bal,closing_bal,transaction) values (1,'06-jan-10',0,13,13);
SQL> select * from transactions;
ID TDATE OPENING_BAL CLOSING_BAL TRANSACTION
---------- --------- ----------- ----------- -----------
1 01-JAN-10 0 10 10
1 02-JAN-10 10 20 10
1 03-JAN-10 20 25 5
1 04-JAN-10 25 -15 -40
1 05-JAN-10 -15 0 15
1 06-JAN-10 0 13 13
6 rows selected.
SQL> select id, count(tdate) as tcount
,max(opening_bal) keep (dense_rank first order by tdate) as opening_bal
,max(closing_bal) keep (dense_rank last order by tdate) as closing_bal
from transactions
where tdate between '02-jan-10' and '04-jan-10'
group by id;
ID TCOUNT OPENING_BAL CLOSING_BAL
---------- ------------ ----------- -----------
1 3 10 -15
SQL>
Oracle How to generate random data (without PL/SQL)
This is a handy way of generating random data. The number of rows
generated is defined by the "connect by level" (currently set to 5).
column s format A5 column r format 999999999999 select level,dbms_random.random r,dbms_random.value(1,10) v,dbms_random.string('','5') s,sysdate+level d from dual connect by level <= 5; LEVEL r V s D ---------- ------------- ---------- ----- --------- 1 384454788 5.86831193 PBZVI 14/AUG/10 2 568121861 8.77328309 YHVDP 15/AUG/10 3 -918508229 6.24565917 CHKXW 16/AUG/10 4 1409236401 4.15254419 HAZUS 17/AUG/10 5 -1356731387 4.12237254 HDDDX 18/AUG/10 5 rows selected.
Oracle How to create a user
SQL> create user DEV identified by DEV;
User created.
SQL> grant create session to dev;
Grant succeeded.
SQL> grant resource to DEV;
Grant succeeded.
SQL> grant select any table to dev;
Grant succeeded.
SQL> grant select_catalog_role to dev;
Grant succeeded.
SQL>
User created.
SQL> grant create session to dev;
Grant succeeded.
SQL> grant resource to DEV;
Grant succeeded.
SQL> grant select any table to dev;
Grant succeeded.
SQL> grant select_catalog_role to dev;
Grant succeeded.
SQL>
Oracle: How to convert to local time
alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
select
cast(from_tz(cast (to_date('2011-01-01 16:00:00') as timestamp),'GMT') at local as date) as LOCAL_EVENT_DATE
from dual;
alter session set succeeded.
LOCAL_EVENT_DATE
-------------------------
2011-01-02 02:00:00
1 rows selected
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