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SQLite Expressions

SQLite Expressions are the combination of one or more values, operators and SQL functions. These expressions are used to evaluate a value.

SQLite expressions are written in query language and used with SELECT statement.

Syntax:

There are mainly three types of SQLite expressions:


1) SQLite Boolean Expression

SQLite Boolean expressions are used to fetch the data on the basis of matching single value.

Syntax:

Example:

We have an existing table named "STUDENT", having the following data:

Sqlite Expressions 1

See this simple example of SQLite Boolean expression.

Output:

Sqlite Expressions 2

2) SQLite Numeric Expressions

SQLite Numeric expression is used to perform any mathematical operations in the query.

Syntax:

Example1:

SELECT (25 + 15) AS ADDITION;

Output:

Sqlite Expressions 3

Numeric expressions contain several built-in functions like avg(), sum(), count(), etc. These functions are known as aggregate data calculation functions.

SELECT COUNT(*) AS "RECORDS" FROM STUDENT;

Output:

Sqlite Expressions 4

3) SQlite Date Expression

SQlite Date expressions are used to fetch the current system date and time values.

Syntax:

SELECT CURRENT_TIMESTAMP;

Output:

Sqlite Expressions 5




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