On 10.07.2012 13:16, Darek Maciera wrote:
2012/7/10 Ananda Kumar <anan...@gmail.com>:
can u show the explain plan for your query
Thanks, for reply!
Sure:
mysql> EXPLAIN SELECT * FROM books WHERE LOWER(ksd)=LOWER('4204661375');
That's definitely not the query you showed the first time around. The
query you're showing here will force a table scan to calculate
LOWER(ksd) for every single row.
Also, how do you know that ksd id unique (as stated in your original
post)? You have no index on it to ensure uniqueness.
You'll have to find some other way to query the table.
Best,
/ Carsten
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