function in mysql xi ip

8/3/2019 Function in MySQL XI IP

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Function in MySQL


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Functions are pre-written program

that perform their specific task

Function Type

Single RowFunction

NumericFunction

StringFunction

Date and TimeFunction

Multi rowfunction

Also Known asAggregate

function


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Single Row Function

It operate on single value and return single

value as output. It produce as many output as

there are inputs. When it applied on table it

return result for every row of the queried

table


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Multiple row function

It operates on a set of rows to return a single

value

** it will be discussed in detail in Class XII


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Numeric Function

1. POWER(x,y) Or POW(x,y)

It return the value of X raised to the power of

YExample : - Select pow(2,5);

output : - 32

Select pow(-2,4); output:- -16Select name,pow(salary,2) from emp


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2. ROUND(X,D) or ROUND(X)

Rounds the argument X to D decimal places

IF the number of decimal pale is not specified or is zero thenumber rounds to nearest integer

Examples :

a) Select round(-1.23) ; output: -1

b) Select round(-1.58); output: -2

c) Select round(1.43); output: 1

d) Select round(6.298,1); output: 6.3

e) Select round(6.235,0); output: 6

f) Select round(56.235,-1); output: -60


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3. TRUNCATE(X,D)

It truncate the number X to D decimal places. If D is 0, theresult has not decimal or fraction part. If D is negative itcauses D digits left of decimal point of the value X to become

zero

Examples:

Select truncate(7.543,1); output: 7.5

Select truncate(4.567,0); output 4

Select truncate(-7.45,1); output: -7.4Select truncate(346,-2); output: 300

Select name,dept,truncate(salary,0) from emp;


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String Function

1. LENGTH(STRING)

It return the length of string i.e. number of character in the given

string

Example:

Select length(computer); output: 8

select name,length(name) from emp;

2. CONCAT(string1,string2,)

it concatenate(join) give string and give output as single string

Example:

Select concat(Sun,Java,..Oracle); output: SunJava..Oracle

Select concat(name, works as a , designation ) from emp


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3. INSTR(str,substr)

it return the position of substring in the given string.

Example:

Select instr(computer,put); output: 4

select name,instr(name,ar) from emp;4. LOWER(string)

return the given string in small letter(lowercase)

Example:

select lower(COMPUTER); output: computer

5. UPPER(string)Example:

Select upper(computer); output: COMPUTER

Select upper(name) from emp;


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6. LEFT(string,n)

it return n number of character from the beginning of string.

Example:

Select left(computer,3); output: com

Select left(name,3);

7. RIGHT(string,n)

it return n number of character from the end of string

Example:

Select right(computer,3); output: ter

Select right(name,4) from emp;


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8. LTRIM(str)

it remove the leading space i.e. from the left side.

Example:

Select ltrim( computer);

9. RTRIM(str)

it remove the trailing spaces i.e. from the right side

Select rtrim(computer );

10. SUBSTRING(str,m,n) or MID(str,m,n)

it return portion of a string. It start from m position and return nnumber of character

Example:

Select substring(computer,4,3); output: put

function in mysql xi ip

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