쿼리문 차이가 뭘까 궁금하네요. 정보
쿼리문 차이가 뭘까 궁금하네요.본문
문득 list.php를 보다가 궁금해졌는데요..
게시물 갯수를 얻는 쿼립니다.
두 쿼리간에 차이가 있나요?
* 첫번째 쿼리
--------------------------------------------------------------
$sql = "select distinct wr_parent from $write_table";
$result = sql_query($sql);
$total_count = mysql_num_rows($result);
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*두번째 쿼리
--------------------------------------------------------------
$sql = "select * from $write_table where wr_is_comment = '0' ";
$result = sql_query($sql);
$total_count = mysql_num_rows($result);
--------------------------------------------------------------
게시물 갯수를 얻는 쿼립니다.
두 쿼리간에 차이가 있나요?
* 첫번째 쿼리
--------------------------------------------------------------
$sql = "select distinct wr_parent from $write_table";
$result = sql_query($sql);
$total_count = mysql_num_rows($result);
--------------------------------------------------------------
*두번째 쿼리
--------------------------------------------------------------
$sql = "select * from $write_table where wr_is_comment = '0' ";
$result = sql_query($sql);
$total_count = mysql_num_rows($result);
--------------------------------------------------------------
Fatal error: Uncaught TypeError: mysqli_fetch_assoc(): Argument #1 ($result) must be of type mysqli_result, null given in /home/kagla/new-sir/old/lib/common.lib.php:2339 Stack trace: #0 /home/kagla/new-sir/old/lib/common.lib.php(2339): mysqli_fetch_assoc() #1 /home/kagla/new-sir/old/skin/board/v16/view.skin.php(795): sql_fetch_array() #2 /home/kagla/new-sir/old/bbs/view.php(403): include_once('...') #3 /home/kagla/new-sir/old/bbs/board.php(300): include_once('...') #4 {main} thrown in /home/kagla/new-sir/old/lib/common.lib.php on line 2339