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Editorial Team
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Asked: 2026-06-04T22:58:06+00:00

I’m relatively new to this stuff, so forgive if the question is dump. Suppose

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I’m relatively new to this stuff, so forgive if the question is dump. Suppose a table with fields: id, str_field. values of str_field is something like “12:17:1246:90”. I want to get all rows where str_field contains e.g. “17”. To do this I’ll need to execute the following command

SELECT id FROM `table_name` WHERE INSTR(str_field, '17')>0

If there’s a large number of rows in the table the query can be slow. Here’s the question: if I’ll index str_field will it increase the spead of query execution?

Thank you in advance!

PS. In other terms I’m asking: does index increase the spead on for the queries like 

SELECT * FROM `table_name` WHERE str_field='value'

?

UPD str_field contains only numbers separated by colons.

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1 Answer

  1. Editorial Team

    You could create a fulltext index and use the special MATCH functionality: http://dev.mysql.com/doc/refman/5.0/en/fulltext-search.html

    Still, searching for values instead of expressions is much faster…

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