Php Mysql Count Rows From Inner Join Group By Stack Overflow

Php Mysql Count Rows From Inner Join Group By Stack Overflow First of all you never want to fetchall () and discard the data just to count the number of rows. there is a better way. secondly, you should try to avoid a nested loop whenever possible because nested loops don't scale very well. and the solution is to use a join or a subquery. you haven't posted your table structures, so this query is untested. Mysql> select teams.team name, (select count(*) from teams inner join players on teams.team id = players.team id) as num of players, teams.team timestamp.

Php Mysql Count Rows From Inner Join Group By Stack Overflow Select users.user id, count (*) as post count from users left join posts on posts.user id = users.user id group by 1 ——— ———— | user id | post count | ——— ———— | 1 | 3 | | 2 | 2 | | 3 | 1 | ——— ———— view raw left join.sql hosted with by github. Mysql, by default, performs an inner join, where only rows with a record in both tables are returned. you can do a left join or right join to tell mysql to return one side of the join even if the other side is empty.

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