SQLite - Expressions

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:

Here is simple examples showing usage of SQLite Boolean Expressions:

sqlite> SELECT * FROM COMPANY WHERE SALARY = 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