SQLite - Useful Functions

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SQLite has many built-in functions to perform processing on string or numeric data. Following is the list of few useful SQLite built-in functions and all are case in-sensitive which means you can use these functions either in lower-case form or in upper-case or in mixed form. For more details, you can check official documentation for SQLite.

Before we start giving examples on the above-mentioned functions, consider COMPANY table with the following records.

 ID NAME AGE ADDRESS SALARY ---------- ---------- ---------- ---------- ---------- 1 Paul 32 California 20000.0 2 Allen 25 Texas 15000.0 3 Teddy 23 Norway 20000.0 4 Mark 25 Rich-Mond 65000.0 5 David 27 Texas 85000.0 6 Kim 22 South-Hall 45000.0 7 James 24 Houston 10000.0 

SQLite COUNT Function

SQLite COUNT aggregate function is used to count the number of rows in a database table. Following is an example −

 sqlite> SELECT count(*) FROM COMPANY; 

The above SQLite SQL statement will produce the following.

 count(*) ---------- 7 

SQLite MAX Function

SQLite MAX aggregate function allows us to select the highest (maximum) value for a certain column. Following is an example −

 sqlite> SELECT max(salary) FROM COMPANY; 

The above SQLite SQL statement will produce the following.

 max(salary) ----------- 85000.0 

SQLite MIN Function

SQLite MIN aggregate function allows us to select the lowest (minimum) value for a certain column. Following is an example −

 sqlite> SELECT min(salary) FROM COMPANY; 

The above SQLite SQL statement will produce the following.

 min(salary) ----------- 10000.0 

SQLite AVG Function

SQLite AVG aggregate function selects the average value for a certain table column. Following is an the example −

 sqlite> SELECT avg(salary) FROM COMPANY; 

The above SQLite SQL statement will produce the following.

 avg(salary) ---------------- 37142.8571428572 

SQLite SUM Function

SQLite SUM aggregate function allows selecting the total for a numeric column. Following is an example −

 sqlite> SELECT sum(salary) FROM COMPANY; 

The above SQLite SQL statement will produce the following.

 sum(salary) ----------- 260000.0 

SQLite RANDOM Function

SQLite RANDOM function returns a pseudo-random integer between -9223372036854775808 and +9223372036854775807. Following is an example −

 sqlite> SELECT random() AS Random; 

The above SQLite SQL statement will produce the following.

 Random ------------------- 5876796417670984050 

SQLite ABS Function

SQLite ABS function returns the absolute value of the numeric argument. Following is an example −

 sqlite> SELECT abs(5), abs(-15), abs(NULL), abs(0), abs("ABC"); 

The above SQLite SQL statement will produce the following.

 abs(5) abs(-15) abs(NULL) abs(0) abs("ABC") ---------- ---------- ---------- ---------- ---------- 5 15 0 0.0 

SQLite UPPER Function

SQLite UPPER function converts a string into upper-case letters. Following is an example −

 sqlite> SELECT upper(name) FROM COMPANY; 

The above SQLite SQL statement will produce the following.

 upper(name) ----------- PAUL ALLEN TEDDY MARK DAVID KIM JAMES 

SQLite LOWER Function

SQLite LOWER function converts a string into lower-case letters. Following is an example −

 sqlite> SELECT lower(name) FROM COMPANY; 

The above SQLite SQL statement will produce the following.

 lower(name) ----------- paul allen teddy mark david kim james 

SQLite LENGTH Function

SQLite LENGTH function returns the length of a string. Following is an example −

 sqlite> SELECT name, length(name) FROM COMPANY; 

The above SQLite SQL statement will produce the following.

 NAME length(name) ---------- ------------ Paul 4 Allen 5 Teddy 5 Mark 4 David 5 Kim 3 James 5 

SQLite sqlite_version Function

SQLite sqlite_version function returns the version of the SQLite library. Following is an example −

 sqlite> SELECT sqlite_version() AS 'SQLite Version'; 

The above SQLite SQL statement will produce the following.

 SQLite Version -------------- 3.6.20