SELECT WHERE in varchar with wildcard - mysql

Question

Lets say i have a table like this
CREATE TABLE Parts (ID int, part_number varchar(100), isActive TINYINT);
and these sample records
|ID | part_number | isActive|
===============================
1 | 1N3.805.327 | 1
2 | 1N3.805.327.B | 1
3 | 1N3.804.108.B | 1
4 | 1N3.804.108.C | 1
5 | 1N3.804.107.B | 1
6 | 1N3.804.107.C | 1
7 | 1N3.804.106.A | 1
8 | 1N3.804.105.A | 1
Problem
I would like to combine a where in clause with the wildcard % operator
In my dbfiddle sample i tried the string function find_in_set and the comparison operator in(). Both do not work:
-- without wildcard the query works
SELECT * FROM Parts WHERE part_number in ('1N3.804.108.B', '1N3.804.106.A'); -- 2
-- with wildcard no records are returned
SELECT * FROM Parts WHERE part_number in ('1N3.804.108%', '1N3.804.106%'); -- 0
SELECT * FROM Parts WHERE FIND_IN_SET(part_number, '1N3.804.108%,1N3.804.106%'); -- 0
Questions
I assume i could use WHERE LEFT(part_number, 11) in ('1N3.804.108', '1N3.804.106') But i do not know if this has any disadvantages.
Is there a way to use a wildcard operator with in()?
Sample records
INSERT INTO
Parts(ID, part_number, isActive)
VALUES
(1, '1N3.805.327',1),
(2, '1N3.805.327.B',1),
(3, '1N3.804.108.B',1),
(4, '1N3.804.108.C',1),
(5, '1N3.804.107.B',1),
(6, '1N3.804.107.C',1),
(7, '1N3.804.106.A',1),
(8, '1N3.804.105.A',1);

Answer 1

Use REGEXP for that, when you want to use OR
CREATE TABLE Parts (ID int, part_number varchar(100), isActive TINYINT);
INSERT INTO
Parts(ID, part_number, isActive)
VALUES
(1, '1N3.805.327',1),
(2, '1N3.805.327.B',1),
(3, '1N3.804.108.B',1),
(4, '1N3.804.108.C',1),
(5, '1N3.804.107.B',1),
(6, '1N3.804.107.C',1),
(7, '1N3.804.106.A',1),
(8, '1N3.804.105.A',1);
✓
✓
SELECT * FROm Parts WHeRE part_number REGEXP '^(1N3.804.108|1N3.804.106)'
ID | part_number | isActive
-: | :------------ | -------:
3 | 1N3.804.108.B | 1
4 | 1N3.804.108.C | 1
7 | 1N3.804.106.A | 1
MySQL Can only UNION a certain number of tables. i think it is about 53.
With an index on partnumber, this will be the fastest.
SELECT * FROm Parts WHeRE part_number REGEXP '^1N3.804.108'
UNION all
SELECT * FROm Parts WHeRE part_number REGEXP '^1N3.804.106'
ID | part_number | isActive
-: | :------------ | -------:
3 | 1N3.804.108.B | 1
4 | 1N3.804.108.C | 1
7 | 1N3.804.106.A | 1
SELECT * FROm Parts WHeRE part_number LIKE '1N3.804.108%'
UNION all
SELECT * FROm Parts WHeRE part_number LIKE '1N3.804.106%'
ID | part_number | isActive
-: | :------------ | -------:
3 | 1N3.804.108.B | 1
4 | 1N3.804.108.C | 1
7 | 1N3.804.106.A | 1
db<>fiddle here

Answer 2

you can also try to do
select *,
REGEXP_LIKE(part_number,[pattern]) as pattern_test from Parts
where pattern_test is TRUE
here first you will create the pattern that you are interested in and apply it on the column you wish to apply it to. The pattern_test will return true if it matches with your pattern and then you can filter on that [where clause]