Oracle PL/SQL Tutorial/Numerical Math Functions/FLOOR — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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Текущая версия на 10:08, 26 мая 2010
Содержание
- 1 FLOOR(-5.2)
- 2 FLOOR(5.8)
- 3 FLOOR for negative value
- 4 FLOOR(x) gets the largest integer less than or equal to x.
- 5 select round(345.678), ceil(345.678), floor(345.678)
- 6 Use floor and mod to get the number of days
- 7 Use FLOOR function to get the flooring value
- 8 Use floor to get the number of weeks
FLOOR(-5.2)
SQL> select FLOOR(-5.2) from dual;
FLOOR(-5.2)
-----------
-6
FLOOR(5.8)
SQL> select FLOOR(5.8) from dual;
FLOOR(5.8)
----------
5
FLOOR for negative value
SQL>
SQL> -- create demo table
SQL> create table myTable(
2 id NUMBER(2),
3 value NUMBER(6,2)
4 )
5 /
Table created.
SQL>
SQL> -- prepare data
SQL> insert into myTable(ID, value)values (1,9)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (2,2.11)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (3,3.44)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (4,-4.21)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (5,10)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (6,3)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (7,-5.88)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (8,123.45)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (9,98.23)
2 /
1 row created.
SQL>
SQL> select * from myTable
2 /
ID VALUE
---------- ----------
1 9
2 2.11
3 3.44
4 -4.21
5 10
6 3
7 -5.88
8 123.45
9 98.23
9 rows selected.
SQL>
SQL>
SQL> SELECT id, value,FLOOR(value) FROM myTable
2 /
ID VALUE FLOOR(VALUE)
---------- ---------- ------------
1 9 9
2 2.11 2
3 3.44 3
4 -4.21 -5
5 10 10
6 3 3
7 -5.88 -6
8 123.45 123
9 98.23 98
9 rows selected.
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table myTable
2 /
Table dropped.
SQL>
SQL>
FLOOR(x) gets the largest integer less than or equal to x.
The following example uses FLOOR() to display the absolute value of 5.8 and -5.2, respectively:
SQL> SELECT FLOOR(5.8), FLOOR(-5.2) FROM dual;
FLOOR(5.8) FLOOR(-5.2)
---------- -----------
5 -6
SQL>
select round(345.678), ceil(345.678), floor(345.678)
SQL>
SQL>
SQL> select round(345.678), ceil(345.678), floor(345.678)
2 from dual;
ROUND(345.678) CEIL(345.678) FLOOR(345.678)
-------------- ------------- --------------
346 346 345
SQL>
SQL>
SQL>
Use floor and mod to get the number of days
SQL>
SQL> create table employees(
2 empno NUMBER(4)
3 , ename VARCHAR2(8)
4 , init VARCHAR2(5)
5 , job VARCHAR2(8)
6 , mgr NUMBER(4)
7 , bdate DATE
8 , msal NUMBER(6,2)
9 , comm NUMBER(6,2)
10 , deptno NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason", "N", "TRAINER", 2, date "1965-12-18", 800 , NULL, 10);
1 row created.
SQL> insert into employees values(2,"Jerry", "J", "SALESREP",3, date "1966-11-19", 1600, 300, 10);
1 row created.
SQL> insert into employees values(3,"Jord", "T" , "SALESREP",4, date "1967-10-21", 1700, 500, 20);
1 row created.
SQL> insert into employees values(4,"Mary", "J", "MANAGER", 5, date "1968-09-22", 1800, NULL, 20);
1 row created.
SQL> insert into employees values(5,"Joe", "P", "SALESREP",6, date "1969-08-23", 1900, 1400, 30);
1 row created.
SQL> insert into employees values(6,"Black", "R", "MANAGER", 7, date "1970-07-24", 2000, NULL, 30);
1 row created.
SQL> insert into employees values(7,"Red", "A", "MANAGER", 8, date "1971-06-25", 2100, NULL, 40);
1 row created.
SQL> insert into employees values(8,"White", "S", "TRAINER", 9, date "1972-05-26", 2200, NULL, 40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C", "DIRECTOR",10, date "1973-04-27", 2300, NULL, 20);
1 row created.
SQL> insert into employees values(10,"Pink", "J", "SALESREP",null,date "1974-03-28", 2400, 0, 30);
1 row created.
SQL>
SQL>
SQL> select ename
2 , floor(mod(sysdate-bdate,7)) as days
3 from employees;
ENAME DAYS
-------- ----------
Jason 5
Jerry 5
Jord 5
Mary 4
Joe 5
Black 6
Red 6
White 6
Yellow 6
Pink 0
10 rows selected.
SQL>
SQL>
SQL> drop table employees;
Table dropped.
SQL>
SQL>
Use FLOOR function to get the flooring value
SQL>
SQL>
SQL> -- create demo table
SQL> create table myTable(
2 id NUMBER(2),
3 value NUMBER(6,2)
4 )
5 /
Table created.
SQL>
SQL> -- prepare data
SQL> insert into myTable(ID, value)values (1,9)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (2,2.11)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (3,3.44)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (4,-4.21)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (5,10)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (6,3)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (7,-5.88)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (8,123.45)
2 /
1 row created.
SQL> insert into myTable(ID, value)values (9,98.23)
2 /
1 row created.
SQL>
SQL> select * from myTable
2 /
ID VALUE
---------- ----------
1 9
2 2.11
3 3.44
4 -4.21
5 10
6 3
7 -5.88
8 123.45
9 98.23
9 rows selected.
SQL>
SQL> SELECT id, value,FLOOR(value) FROM myTable
2 /
ID VALUE FLOOR(VALUE)
---------- ---------- ------------
1 9 9
2 2.11 2
3 3.44 3
4 -4.21 -5
5 10 10
6 3 3
7 -5.88 -6
8 123.45 123
9 98.23 98
9 rows selected.
SQL>
SQL>
SQL> -- clean the table
SQL> drop table myTable
2 /
Table dropped.
SQL>
SQL>
Use floor to get the number of weeks
SQL>
SQL>
SQL> create table employees(
2 empno NUMBER(4)
3 , ename VARCHAR2(8)
4 , init VARCHAR2(5)
5 , job VARCHAR2(8)
6 , mgr NUMBER(4)
7 , bdate DATE
8 , msal NUMBER(6,2)
9 , comm NUMBER(6,2)
10 , deptno NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason", "N", "TRAINER", 2, date "1965-12-18", 800 , NULL, 10);
1 row created.
SQL> insert into employees values(2,"Jerry", "J", "SALESREP",3, date "1966-11-19", 1600, 300, 10);
1 row created.
SQL> insert into employees values(3,"Jord", "T" , "SALESREP",4, date "1967-10-21", 1700, 500, 20);
1 row created.
SQL> insert into employees values(4,"Mary", "J", "MANAGER", 5, date "1968-09-22", 1800, NULL, 20);
1 row created.
SQL> insert into employees values(5,"Joe", "P", "SALESREP",6, date "1969-08-23", 1900, 1400, 30);
1 row created.
SQL> insert into employees values(6,"Black", "R", "MANAGER", 7, date "1970-07-24", 2000, NULL, 30);
1 row created.
SQL> insert into employees values(7,"Red", "A", "MANAGER", 8, date "1971-06-25", 2100, NULL, 40);
1 row created.
SQL> insert into employees values(8,"White", "S", "TRAINER", 9, date "1972-05-26", 2200, NULL, 40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C", "DIRECTOR",10, date "1973-04-27", 2300, NULL, 20);
1 row created.
SQL> insert into employees values(10,"Pink", "J", "SALESREP",null,date "1974-03-28", 2400, 0, 30);
1 row created.
SQL>
SQL>
SQL> select ename ,floor((sysdate-bdate)/7) as weeks
2 from employees;
ENAME WEEKS
-------- ----------
Jason 2222
Jerry 2174
Jord 2126
Mary 2078
Joe 2030
Black 1982
Red 1934
White 1886
Yellow 1838
Pink 1791
10 rows selected.
SQL>
SQL>
SQL> drop table employees;
Table dropped.