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SET AUTOCOMMIT = 0
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--------------
START TRANSACTION
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--------------
DROP DATABASE IF EXISTS `base`
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--------------
CREATE DATABASE `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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DROP TABLE IF EXISTS `test`
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CREATE TABLE `test`
( `id` integer unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY,
`text` varchar(255) NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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INSERT INTO `test` (`text`) VALUES
('cat the'),('these cats'), ('their cat'),('that cat'),('cat and cats'),('dog and dogs')
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select * from test order by id
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+----+--------------+
| id | text |
+----+--------------+
| 1 | cat the |
| 2 | these cats |
| 3 | their cat |
| 4 | that cat |
| 5 | cat and cats |
| 6 | dog and dogs |
+----+--------------+
--------------
select length(text),
length(replace(text, 'cat', '')),
length('cat'),
cast(((length(text) - length(replace(text, 'cat', ''))) / length('cat')) as unsigned) as nbre
from `test`
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+--------------+----------------------------------+---------------+------+
| length(text) | length(replace(text, 'cat', '')) | length('cat') | nbre |
+--------------+----------------------------------+---------------+------+
| 7 | 4 | 3 | 1 |
| 10 | 7 | 3 | 1 |
| 9 | 6 | 3 | 1 |
| 8 | 5 | 3 | 1 |
| 12 | 6 | 3 | 2 |
| 12 | 12 | 3 | 0 |
+--------------+----------------------------------+---------------+------+
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select sum(cast(((length(text) - length(replace(text, 'cat', ''))) / length('cat')) as unsigned)) as nbre
from `test`
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+------+
| nbre |
+------+
| 6 |
+------+
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COMMIT
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SET AUTOCOMMIT = 1
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