Re: [SQL] INDEX and LIKE

[Olivier Hubaut]

On Mon, 29 Nov 2004 12:19:12 +0000, T E Schmitz  
<[EMAIL PROTECTED]> wrote:

Hello,
I need to be able to perform wildcard searches on a VARCHAR(100) column  
of the form

SELECT * FROM item WHERE serial_no LIKE '%12345678%'
Would an index on serial_no do anything at all for this search?
No, It wouldn't. If you use "%" for the beginning of you search pattern, a  
seqential search is performed, ignoring the index wich use the beginning  
of the string in order to create it's B-tree.

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