Having子句允許指定條件來過濾將出現(xiàn)在最終結(jié)果的分組結(jié)果宏所。
WHERE子句在所選列上設(shè)置條件肚邢，而Having子句則在由Group By子句創(chuàng)建的分組這是條件壹堰。
語法#
SELECT
FROM
WHERE
GROUP BY
HAVING
ORDER BY
SELECT column1, column2
FROM table1, table2
WHERE [conditions]
GROUP BY column1, column2
HAVING [conditions]
ORDER BY column1, column2
實(shí)例#
樣例表
SELECT * FROM COMPANY GROUP BY name HAVING count(name) < 2;
