[英]SELECT limiting to only results based on a CSV list from a separate table
所以我在一个表中有一个CSV列表。 (EG: 1,3,19
)我想从另一个ID匹配其中任何一个的表中搜索出所有用户名。
我觉得我应该能够做类似的事情:
<?
$query = "SELECT player_ids FROM cast_list WHERE game='".$gameid."' ";
$result = mysql_query($query) or die(mysql_error());
$playerquery = "SELECT username,id FROM players WHERE id IN (".$result.") ORDER BY username;
$player_result = mysql_query($playerquery) or die(mysql_error());
echo "<ul>";
while ($row = mysql_fetch_array($player_result) ) {
echo "<li>".$row['username']."</li>";
}
echo "</ul>";
?>
但我无法正常工作。 我究竟做错了什么?
您还可以使用子查询 (这样会更快):
$playerquery = "SELECT username,id
FROM players
WHERE id IN (SELECT player_ids FROM cast_list WHERE game='".$gameid."')
ORDER BY username";
顺便说一句,如果game
是一个整数字段,则您无需在该值前后加上引号( '
'
)。
这个想法是正确的,但是您需要将$result
转移到实际的字符串数组中:
$game_ids = array();
while ($row = mysql_fetch_array($result) ) {
$game_ids[] = .$row[1];
}
现在使用implode
将数组转换为用逗号分隔的逗号分隔值:
$playerquery = "SELECT username,id FROM players WHERE id IN (" . implode(",",$result) . ") ORDER BY username;
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