count from FOLDOC

count

One of the built-in aggregate functions in relational database systems, that returns the number of rows in a result. The argument to the function is often "*", e.g.

 SELECT COUNT(*) FROM books

which returns the number of rows in the "books" table. If, instead, we say

 SELECT COUNT(publisher) FROM books

then only rows with a non-null value in the "publisher" column will be counted.

Last updated: 2010年09月26日

Nearby terms:

Cougar ♦ cough and die ♦ count ♦ countable ♦ countably many ♦ counted

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