Number Functionsi

•• ROUND:: Rounds valuel toto specifiedifi decimali l

ROUND(45( ..926,, 2)) 45..93

•• TRUNC::Truncatesr t valuel toto specifiedifi decimali l

TRUNC(45( ..926,, 2)) 45..92

•• MOD:: Returnst r remainderr i r off divisioni i i

MOD(1600,( , 300)) 100

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Usingi the ROUND Functioni

SQL> SELECT ROUND(45.923,2), ROUND(45.923,0), 2 ROUND(45.923,-1)

3 FROM DUAL;

ROUND(45.923,2) ROUND(45.923,0) ROUND(45.923,-1)

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Usingi the TRUNC Functioni

SQL> SELECT TRUNC(45.923,2), TRUNC(45.923), 2 TRUNC(45.923,-1)

3 FROM DUAL;

3-14

Usingi the MOD Functioni

Calculate the remainder of the ratio of salary to commission for all employees whose job title is a salesman.

3-15

Workingi withi Dates

•• Oracler le storest r datest inin an internali t r l numericric formatf r t:: Century,t r , year,r, month,t , day,, hours,r , minutes,i t , seconds..

•• The defaultf lt datete formatf r t isis DD--MON--YY..

•• SYSDATE isis a functionf ti returningr t r i datete and timeti ..

•• DUAL isis a dummy tablet le used toto viewi

SYSDATE..

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Arithmetici ic withi Dates

•• Add orr subtracttr t a numberr toto orr fromfr a datete forf r a resultantr lt t datete valuel ..

•• Subtracttr t twot datest toto findfi thet numberr off days betweent thoset datest ..

•• Add hoursrs toto a datete by dividingi i i thet numberr off hoursrs by 24..

3-17

Usingi Arithmetici ic Operators withi Dates

SQL> SELECT ename, (SYSDATE-hiredate)/7 WEEKS 2 FROM emp

3WHERE deptno = 10;

3-18

Date Functionsi

3-19

Usingi Date Functionsi

• MONTHS_BETWEEN ('01-SEP-95','11-JAN-94')

19.6774194

• NEXT_DAY ('01-SEP-95','FRIDAY') '08-SEP-95'

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Usingi Date Functionsi

• ROUND('25-JUL-95','MONTH') 01-AUG-95

• TRUNC('25-JUL-95','MONTH') 01-JUL-95

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