计算mysql中唯一数据的出现次数
因此,我知道,如果我想计算具有相同城市名称的条目数量,我将使用以下代码:计算mysql中唯一数据的出现次数,mysql,count,Mysql,Count,因此,我知道,如果我想计算具有相同城市名称的条目数量,我将使用以下代码: SELECT *, COUNT(*) AS count FROM location GROUP BY city ORDER BY count DESC 如果我想计算相同城市名称和州名称的条目数量,我将如何进行 citynameA,stateNameB=同时具有相同cityname和statename的条目数您可以将多个字段与group by一起使用,例如 SELECT city, state, COUNT(*) AS c
SELECT *, COUNT(*) AS count
FROM location
GROUP BY city
ORDER BY count
DESC
如果我想计算相同城市名称和州名称的条目数量,我将如何进行
citynameA,stateNameB=同时具有相同cityname和statename的条目数您可以将多个字段与group by一起使用,例如
SELECT city, state, COUNT(*) AS count
FROM location
GROUP BY city, state
ORDER BY count
DESC
您可以将多个字段与分组依据一起使用,例如
SELECT city, state, COUNT(*) AS count
FROM location
GROUP BY city, state
ORDER BY count
DESC
按城市、州分组
?按城市、州分组
?可能需要按计数、州、市
排序。可能需要按计数、州、市
排序。