回答編集履歴
3
追記しました
test
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@@ -1,6 +1,10 @@
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1
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-
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1
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+
######修正分
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2
2
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3
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+
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4
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+
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+
サブクエリで遅いというのは、こんな感じにした場合ことでしょうか？
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6
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+
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3
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-
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7
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+
SQLがあると、アドバイスがつきやすいかもしれません。
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8
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9
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6
10
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@@ -14,8 +18,16 @@
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18
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on ...
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16
20
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join (select ... // fooの数とコメントの数が一致していれば、postsとcommentsをjoinできるような要素を出力する
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22
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+
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from comments
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+
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goup by postid) as filterdComments
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+
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on ...
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+
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join comments
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30
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19
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on
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31
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on ...
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20
32
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21
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```
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2
微修正
test
CHANGED
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@@ -16,6 +16,6 @@
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16
16
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join comments
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18
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on (... and xxx = hoge)
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on (... and xxx = hoge) --※xxx = hoge はそれらしい条件に置き換えてください
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20
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21
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```
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1
まちがえたので修正～
test
CHANGED
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@@ -10,22 +10,12 @@
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10
10
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from users
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12
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join (select ...
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14
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-
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-
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13
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join posts
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16
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-
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join (select ...
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-
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from comments
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-
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where ...)
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-
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on ...
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-
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where ...)
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14
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on ...
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16
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-
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join comments
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+
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on (... and xxx = hoge)
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30
20
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31
21
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```
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