I have two tables: news and comments.
i want to count the number of comments for each newsid and update the
count in news.comment
comments.newsid belongs to news.id
can i do this with sub queries? im using v4.1.x
i have many records in the comments table so im not sure what the most
efficient way to do it.
i will likely run this as update every few minutes because doing a join
on the fly is going to hurt performance when i need to display the
comment count on the webpage i think.
any help?
table: news
+----+-----------+
| id | comments |
+----+-----------+
| 26 | 0 |
| 21 | 0 |
| 29 | 0 |
+---------------
table: comments
+-----+--------+
| id | newsid |
+-----+--------+
| 1 | 26 |
| 2 | 21 |
| 3 | 29 |
| 4 | 29 |
| 5 | 29 |
+-------------+
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