Question

fI似乎是一个相对简单的AND / OR条款让我有点头疼。

$query = "SELECT stv.name,stc.tmplvarid,stc.contentid,stv.type,stv.display,stv.display_params,stc.value";
$query .= " FROM ".$tb1." stc LEFT JOIN ".$tb2." stv ON stv.id=stc.tmplvarid ";
$query .= " LEFT JOIN $tb_content tb_content ON stc.contentid=tb_content.id ";
$query .= " WHERE stv.name='".$region."' AND stc.contentid IN (".implode($cIDs,",").") ";
$query .= " OR stv.name='".$countries."' AND stc.contentid IN (".implode($cIDs,",").") ";
$query .= " AND tb_content.pub_date >= '$pub_date' ";
$query .= " AND tb_content.published = 1 ";
$query .= " ORDER BY stc.contentid ASC;";

我需要它来检索$region和$countries的值。但是，它的方式只返回$countries的值。如果我使用OR删除该行，则会返回$region的值，但不会返回两者。我做错了什么？

Answer 1

尝试在OR两侧的子句周围加上括号。见下文：

$query = "SELECT stv.name,stc.tmplvarid,stc.contentid,stv.type,stv.display,stv.display_params,stc.value"; 
$query .= " FROM ".$tb1." stc LEFT JOIN ".$tb2." stv ON stv.id=stc.tmplvarid "; 
$query .= " LEFT JOIN $tb_content tb_content ON stc.contentid=tb_content.id "; 
$query .= " WHERE (stv.name='".$region."' AND stc.contentid IN (".implode($cIDs,",").")) "; 
$query .= " OR (stv.name='".$countries."' AND stc.contentid IN (".implode($cIDs,",").")) "; 
$query .= " AND tb_content.pub_date >= '$pub_date' "; 
$query .= " AND tb_content.published = 1 "; 
$query .= " ORDER BY stc.contentid ASC;";

Answer 2

看起来你缺少括号，不是吗？

A或B和C或D 不明确，您需要使用括号表明您的意思（A或B）和（C或D） < / p>

使用AND / OR逻辑运算符的SQL查询

2 个答案: