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Displaying posts with tag: count(*) (reset)

MySQL select count
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posted by Ilan Hazan on Mon 20 Dec 2010 11:45 UTC
Tags:
(edit) mysql, count(*), mysql count
COUNT function counts the number of rows retrieved by a SELECT statement. The return value is of type BIGINT. The COUNT(expr) function count the number of non-NULL values of expr in the rows retrieved by a SELECT statement. SELECT COUNT(expr) FROM tbl; In contrast, COUNT(*) is different in that it returns a count of the [...]
Limited SELECT count(*)
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posted by Ilan Hazan on Thu 13 May 2010 21:52 UTC
Tags:
(edit) select, performance, limit, Cool MySQL Queries, count(*), limited count
A SELECT statement with COUNT returns the number of rows retrieved by the SELECT statement (see mysql select count). For performance reasons, the desired result is to limit that count. Including a LIMIT clause in the SELECT statement will not work since it only restricts the number of rows returned, which is always one. The [...]
Showing entries 1 to 2

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