Use table of char as an array
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
08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester
8 rows selected.
SQL>
SQL>
SQL>
SQL> -- Nested loops and labels
SQL>
SQL> DECLARE
2 v_current_month INTEGER := TO_CHAR(SYSDATE,'MM');
3 myNumber INTEGER;
4 TYPE char4list IS TABLE OF CHAR(4);
5 month_list char4list := char4list('Jan','Feb','Mar','Apr','May','June','July','Aug','Sept','Oct','Nov','Dec');
6 day_list char4list := char4list('Sun','Mon','Tues','Wed','Thur','Fri','Sat');
7 BEGIN
8
9 FOR i IN 1..v_current_month LOOP
10 DBMS_OUTPUT.PUT_LINE(month_list(i));
11
12 FOR j IN 1..7 LOOP
13
14 SELECT COUNT(*)
15 INTO myNumber
16 FROM employee
17 WHERE TO_CHAR(Start_Date,'fmYYYYMMD') =
18 TO_CHAR(SYSDATE,'YYYY')||TO_CHAR(i)||TO_CHAR(j);
19
20 DBMS_OUTPUT.PUT_LINE(day_list(j)||' '||myNumber);
21 END LOOP;
22 END LOOP;
23 END;
24 /
Jan
Sun 0
Mon 0
Tues 0
Wed 0
Thur 0
Fri 0
Sat 0
Feb
Sun 0
Mon 0
Tues 0
Wed 0
Thur 0
Fri 0
Sat 0
Mar
Sun 0
Mon 0
Tues 0
Wed 0
Thur 0
Fri 0
Sat 0
Apr
Sun 0
Mon 0
Tues 0
Wed 0
Thur 0
Fri 0
Sat 0
May
Sun 0
Mon 0
Tues 0
Wed 0
Thur 0
Fri 0
Sat 0
June
Sun 0
Mon 0
Tues 0
Wed 0
Thur 0
Fri 0
Sat 0
July
Sun 0
Mon 0
Tues 0
Wed 0
Thur 0
Fri 0
Sat 0
Aug
Sun 0
Mon 0
Tues 0
Wed 0
Thur 0
Fri 0
Sat 0
Sept
Sun 0
Mon 0
Tues 0
Wed 0
Thur 0
Fri 0
Sat 0
PL/SQL procedure successfully completed.
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
2 /
Table dropped.
SQL>
SQL>
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