What does "expr" do in MySQL's COUNT(expr) function?
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SELECT COUNT(*) FROM table; SELECT COUNT(1) FROM table; SELECT COUNT(-2) FROM table; SELECT COUNT(135392) FROM table; SELECT COUNT(field) FROM table; SELECT COUNT(field1 + field2) FROM table;
I am not clear on what
expr actually does, or what it can be used for because all of the above SQL statements return the same result. Example below:
+-----------+ | count(..) | +-----------+ | 54542 | +-----------+
MySQL's manual (https://dev.mysql.com/doc/refman/8.0/en/counting-rows.html) does not go into very much detail on the
expr part, other than using the
COUNT(<expr>) counts the number of rows where
<expr> evaluates to a non-
Generally, it is not needed with an expression and would only be used on a single,
NULL-able column -- or column that could be
NULL due to an outer join.
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Expr is short for expression, itself short for "some valid block of sql that results in a single value for this row when evaluated"
It could be a constant, a column, the result of a function call, variable assignment, case statement etc
—equivalent COUNT(*) COUNT(1) COUNT(‘a’) —count only males. If the group is 1000 in number and 600 are female, this returns 400 COUNT(case when gender = ‘m’ then ‘a’ else null end)
In supplement to the other answers, the
<expr> may optionally start with the word DISTINCT in which case only unique occurrences of the referenced entity/expression/function result are counted
—in a set of 1000 animals, returns 1000 COUNT(gender) —in a set of 1000 animals, 600 female, returns 2 (only values M and F exist in the group) COUNT(distinct gender)
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- The doc link you mentioned is incomplete. This would be a complete one (also referenced in your source link): dev.mysql.com/doc/refman/8.0/en/…