PostgreSQL pattern match query does not work as expected [duplicate] - sql

Question

I looked around some and didn't find what I was after so here goes.
SELECT * FROM trees WHERE trees.`title` LIKE '%elm%'
This works fine, but not if the tree is named Elm or ELM etc...
How do I make SQL case insensitive for this wild-card search?
I'm using MySQL 5 and Apache.

Answer 1

I've always solved this using lower:
SELECT * FROM trees WHERE LOWER( trees.title ) LIKE '%elm%'

Answer 2

SELECT *
FROM trees
WHERE trees.`title` COLLATE UTF8_GENERAL_CI LIKE '%elm%'
Actually, if you add COLLATE UTF8_GENERAL_CI to your column's definition, you can just omit all these tricks: it will work automatically.
ALTER TABLE trees
MODIFY COLUMN title VARCHAR(…) CHARACTER
SET UTF8 COLLATE UTF8_GENERAL_CI.
This will also rebuild any indexes on this column so that they could be used for the queries without leading '%'

Answer 3

The case sensitivity is defined in the columns / tables / database collation settings. You can do the query under a specific collation in the following way:
SELECT *
FROM trees
WHERE trees.`title` LIKE '%elm%' COLLATE utf8_general_ci
for instance.
(Replace utf8_general_ci with whatever collation you find useful). The _ci stands for case insensitive.

Answer 4

This is the example of a simple LIKE query:
SELECT * FROM <table> WHERE <key> LIKE '%<searchpattern>%'
Now, case-insensitive using LOWER() func:
SELECT * FROM <table> WHERE LOWER(<key>) LIKE LOWER('%<searchpattern>%')

Answer 5

Simply use :
"SELECT * FROM `trees` WHERE LOWER(trees.`title`) LIKE '%elm%'";
Or Use
"SELECT * FROM `trees` WHERE LCASE(trees.`title`) LIKE '%elm%'";
Both functions works same

Answer 6

I'm doing something like that.
Getting the values in lowercase and MySQL does the rest
$string = $_GET['string'];
mysqli_query($con,"SELECT *
FROM table_name
WHERE LOWER(column_name)
LIKE LOWER('%$string%')");
And For MySQL PDO Alternative:
$string = $_GET['string'];
$q = "SELECT *
FROM table_name
WHERE LOWER(column_name)
LIKE LOWER(?);";
$query = $dbConnection->prepare($q);
$query->bindValue(1, "%$string%", PDO::PARAM_STR);
$query->execute();

Answer 7

use ILIKE
SELECT * FROM trees WHERE trees.`title` ILIKE '%elm%';
it worked for me !!

Answer 8

Non-binary string comparisons (including LIKE) are case insensitive by default in MySql:
https://dev.mysql.com/doc/refman/en/case-sensitivity.html

Answer 9

I think this query will do a case insensitive search:
SELECT * FROM trees WHERE trees.`title` ILIKE '%elm%';

Answer 10

You don't need to ALTER any table. Just use the following queries, prior to the actual SELECT query that you want to use the wildcard:
set names `utf8`;
SET COLLATION_CONNECTION=utf8_general_ci;
SET CHARACTER_SET_CLIENT=utf8;
SET CHARACTER_SET_RESULTS=utf8;

Answer 11

well in mysql 5.5 , like operator is insensitive...so if your vale is elm or ELM or Elm or eLM or any other , and you use like '%elm%' , it will list all the matching values.
I cant say about earlier versions of mysql.
If you go in Oracle , like work as case-sensitive , so if you type like '%elm%' , it will go only for this and ignore uppercases..
Strange , but this is how it is :)

Answer 12

SELECT name
FROM gallery
WHERE CONVERT(name USING utf8) LIKE _utf8 '%$q%'
GROUP BY name COLLATE utf8_general_ci LIMIT 5

Answer 13

You must set up proper encoding and collation for your tables.
Table encoding must reflect the actual data encoding. What is your data encoding?
To see table encoding, you can run a query SHOW CREATE TABLE tablename

Answer 14

When I want to develop insensitive case searchs, I always convert every string to lower case before do comparasion

Answer 15

I've always solved like this:
SELECT * FROM trees WHERE LOWER( trees.title ) LIKE LOWER('%elm%');

Answer 16

For example if you want to search name like Raja not raja, Royal not royal etc, add BINARY before column name in WHERE clause.
SELECT name FROM person_tbl
WHERE BINARY name LIKE "R%";