Using SQL and given a table X with columns labeled A, B, C, and D -how do you get the count where column A = ‘TREK’

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SQL
Using SQL and given a table X with columns labeled A, B, C, and D - how do you get the count where column A = 'TREK'?

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<pre>SELECT COUNT(A) FROM X WHERE A=’TREK’;</pre>

is the usual way, and also the most efficient.
If you want to do several independent counts of the same table in one query, you can do something like this:

<pre>
SELECT SUM (
CASE
WHEN a = ‘TREK’
THEN 1
END
) AS a_trek
, SUM (
CASE
WHEN b = ‘FOO’
THEN 1
END
) AS b_foo
FROM x
WHERE c = ‘FIRBOLIG’;
</pre>

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