MySQL FIELD one of the String Function, which will return the index position of the string (specified in the first argument) by looking in the remaining string expression(s). If all the arguments present in the FILED function are integers then they are compared as numbers. If they are strings then they are compared as the string values. In this article we will show you, How to write String FILED function in MySQL with example.
MySQL FIELD Syntax
The basic syntax of String FIELD in MySQL is as shown below:
SELECT FIELD (Str, Str1, Str2,....,StrN) FROM Source
From the above FIELD function will return the index position of the Str by checking Str1 to StrN based. For example, ELT(‘Hello’, ‘Hi’, ‘Hello’) return 2 as the output.
MySQL FIELD Example 1
The FIELD function is used to return the index position of specified string. The following query will show you multiple ways to use this FILED function.
-- MySQL String FIELD Function Example
-- Though the string at position 1 start with A, it is not equal to A
SELECT FIELD('A', 'ABC', 'DEF', 'G', 'H', 'I');
SELECT FIELD('MySQL', 'Learn', 'MySQL', 'Server', 'at', 'tutorialgateway.org');
SELECT FIELD('tutorialgateway.org', 'Learn', 'MySQL', 'Server', 'at', 'tutorialgateway.org');
-- It returns 0 because there is no 'at' string
SELECT FIELD('at', 'Learn', 'MySQL', 'Server');
-- It will return the index position of First Occurence
SELECT FIELD('MySQL', 'Learn', 'MySQL', 'Server', 'at', 'MySQL');
OUTPUT
Let me show you, what will happen, if we specify integers, and NULL values as the arguments.
-- MySQL String FIELD Function Example
SELECT FIELD('2', '12', '13', '2', '15', '19');
SELECT FIELD(2, 12, 13, 2, 15, 19);
SELECT FIELD(2, 22, 222, 2222);
SELECT FIELD(NULL, 'Learn', NULL, 'MySQL', 'Tutorial');
OUTPUT
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