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Monday, May 21, 2018

SQL Tutorial 7: SQL Operators


SQL Tutorial 7: SQL Operators

An operator is a reserved give-and-take or a grapheme used primarily inwards an SQL statement's WHERE clause to perform operation(s), such equally arithmetic, comparisons as well as  Logical operations.

Operators are used to specify weather condition inwards an SQL tilt as well as to serve as 
conjunctions for multiple weather condition inwards a statement.

Important Categories of SQL Operators are,

1) Arithmetic operators
2) Comparison operators
3) Logical operators Etc...
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1) Arithmetic Operators:

Arithmetic operators tin perform arithmetical operations on numeric operands 
involved. 

Operator Description 

+  Add 
-  Subtract 
*  Multiply 
/  Division 
%  Modulus

Examples: 

i) Add (+)
SELECT thirty + 20;

ii) Subtract (-)
SELECT thirty - 20;

iii) Multiply (*)
Select thirty * 20;

iv) Division
Select xl / 20;

v) Modulus (%)
Select xl % 19;
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2) Comparison Operators:

A comparing (or relational) operator is a mathematical symbol which is used to 
compare betwixt 2 values.

Comparison operators are used inwards weather condition that compare 1 seem with 
another. The number of a comparing tin move TRUE, FALSE, or UNKNOWN 
(an operator that has 1 or 2 NULL expressions returns UNKNOWN).

The next tabular array describes dissimilar types of comparing operators 

Operator Description 

=    Equal to 
>    Greater than 
<    Less than 
>=  Greater than or equal to 
<=  Less than or equal to 
<>  Not equal to 

Examples:

i) Select * From abcd
Where City='Pune';

ii) Select * From abcd
Where Age > 25;

iii) Select * From abcd
Where Age >= 25;

iv) Select * From abcd
Where Age < 25;

v) Select * From abcd
Where Age <= 25;

vi) Select * From abcd
Where Age <> 25;                             
---------------------------
An operator is a reserved give-and-take or a grapheme used primarily inwards an SQL tilt SQL Tutorial 7: SQL Operators
3) Logical Operators:

There are 3 Logical Operators namely, AND, OR, as well as NOT. These operators 
compare 2 weather condition at a fourth dimension to cause upwards one's hear whether a row tin move selected for the output. When retrieving information using a SELECT statement, You tin purpose logical operators inwards the WHERE clause, which allows yous to combine more than 1 condition.

Operator     Description

ALL             TRUE if all of the sub-query values encounter the condition 
AND            TRUE if all the weather condition separated past times AND is TRUE 
ANY            TRUE if whatever of the sub-query values encounter the condition 
BETWEEN    TRUE if the operand is inside the arrive at of comparisons 
EXISTS       TRUE if the sub-query returns 1 or to a greater extent than records 
IN              TRUE if the operand is equal to 1 of a listing of expressions 
LIKE           TRUE if the operand matches a designing Try it
NOT           Displays a tape if the condition(s) is NOT TRUE 
OR             TRUE if whatever of the weather condition separated past times OR is TRUE 
SOME         TRUE if whatever of the sub-query values encounter the condition

Examples:

i) And
Select * From abcd
Where Age > 25 And City ='Hyderabad';

ii) Or
Select * From abcd
Where Age > xl Or City ='Pune';

iii) Between
Select * From abcd
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