mysql - SQL 返回计数 + 其他列

Question

我有以下 SQL 查询:"SELECT * FROM table WHERE id = '$geo_name_id' ORDER BY timestamp DESC LIMIT 10 OFFSET $offset"

这很好用，但现在我还想返回整个表 WHERE id = 'geo_name_id 中的行数(没有限制)。我试过这样的事情:

"SELECT COUNT(*) as totalExpectedItems, * FROM  story_img_vid WHERE id = '$geo_name_id' ORDER BY timestamp DESC LIMIT 10 OFFSET $offset"

但是这似乎并没有像预期的那样工作，因为它只返回一行。

Answer 1

使用子查询:

"SELECT t.*,
        (SELECT COUNT(*) FROM table
         WHERE id = '$geo_name_id') as cnt
  FROM  table t
  WHERE t.id = '$geo_name_id'
  ORDER BY t.timestamp DESC
  LIMIT 10 OFFSET $offset"

cnt 列将包含计数。

或连接到派生表:

"SELECT t.*,
        t2.cnt
 FROM table t
 JOIN(SELECT s.id,count(*) as cnt
      FROM table s GROUP BY s.id) t2
  ON(t.id = t2.id)
WHERE t.id = '$geo_name_id'
ORDER BY t.timestamp DESC
LIMIT 10 OFFSET $offset"