Numerical Functions for Oracle Database

rounded up

1. Grammar

ROUND(n[,m])

Omit m: 0

m>0: m digits after the decimal point

m<0: m digits before the decimal point

n represents the value to be rounded.

m indicates the number of digits after or before the decimal point to be retained.

2. Examples

1. SQL>select round(23.4),round(23.45,1),round(23.45,-1)from dual;
3. ROUND(23.4) ROUND(23.45,1) ROUND(23.45,-1)
4. ----------------------------------------
5. 2323.520

 

Two rounding function

1. Grammar

CEIL (n)

FLOOR(n)

2. Examples

1. SQL>select ceil(23.45),floor(23.45)from dual;
3. CEIL(23.45) FLOOR(23.45)
4. -----------------------
5. 2423

 

Three commonly used calculation functions

1. Grammar

ABS(n)

MOD(m,n): If there is a null value in m and n, the result returns null.

POWER(m,n): Indicates the n-th power of m.

SQRT(n): find the square root

2. Examples

1. SQL>select abs(23.45),abs(-23),abs(0)from dual
2. 2;
4. ABS(23.45) ABS(-23) ABS(0)
5. ------------------------------
6. 23.45230
8. SQL>select mod(5,2)from dual;
10. MOD(5,2)
11. ----------
12. 1
14. SQL>select mod(5,null)from dual;
16. MOD(5,NULL)
17. -----------
20. SQL>select power (2,3),power(null,3)from dual;
22. POWER(2,3) POWER(NULL,3)
23. -----------------------
24. 8
26. SQL>select sqrt(16)from dual;
28. SQRT(16)
29. ----------
30. 4

 

Four trigonometric functions

1. Grammar

SIN (n) 、 ASIN (n)

COS(n)、ACOS(n)

TAN(n)、ATAN(n)

2. Examples

1. SQL>select sin(1.57)from dual;
3. SIN(1.57)
4. ----------
5. .999999683