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SQLite - Expressions


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SQLite - Expressions


SQL Expression is a combination of one or more values, operators and SQL functions that evaluate to a value. Expressions are like formulas and they are written in query language, so you can also use to query the database for specific set of data.


Syntax:


SELECT column1, column2, columnN

FROM table_name

WHERE [CONTION | EXPRESSION];

 

Here we are going to show different types of SQLite expressions, those are mentioned below:

SQLite - Boolean Expressions:

SQLite Boolean Expressions fetch the data on the basis of matching single value. Following is the syntax:

SELECT column1, column2, columnN

FROM table_name

WHERE SINGLE VALUE MATCHTING EXPRESSION;

Consider COMPANY table has the following records:

ID

NAME

AGE

ADDRESS

SALARY

1

Sanjay

32

Delhi

20000

2

Vivek

25

Lucknow

15000

3

Bhaskar

23

Kanpur

20000

4

Subhash

25

Allahabad

65000

5

David

27

Mumbai

85000

6

Kim

22

Kerla

45000

7

Jagmohan

24

Varanasi

10000

Here is simple examples showing usage of SQLite Boolean Expressions:

sqlite> SELECT * FROM COMPANY WHERE SALARY = 10000;

ID

NAME

AGE

ADDRESS

SALARY

7

Jagmohan

24

Varanasi

10000

 

SQLite - Numeric Expression:


syntax:


SELECT numerical_expression as  OPERATION_NAME

[FROM table_name WHERE CONDITION] ;

Here, numerical_expression is used for mathematical expression or any formula. Following is a simple example showing usage of SQLite Numeric Expressions:

sqlite> SELECT (15 + 6) AS ADDITION

ADDITION = 21

There are several built-in functions like avg(), sum(), count(), etc., to perform what is known as aggregate data calculations against a table or a specific table column.

sqlite> SELECT COUNT(*) AS "RECORDS" FROM COMPANY;

RECORDS = 7

 

SQLite - Date Expressions:

Date Expressions return current system date and time values and these expressions will be used in various data manipulations.

sqlite>  SELECT CURRENT_TIMESTAMP;

CURRENT_TIMESTAMP = 2013-03-17 10:43:35


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