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-rw-r--r--src/Components/JoinKeyword.php6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/Components/JoinKeyword.php b/src/Components/JoinKeyword.php
index 9ec681b..7546b56 100644
--- a/src/Components/JoinKeyword.php
+++ b/src/Components/JoinKeyword.php
@@ -179,8 +179,10 @@ class JoinKeyword extends Component
{
$ret = array();
foreach ($component as $c) {
- $ret[] = array_search($c->type, static::$JOINS) . ' '
- . $c->expr . ' ON ' . Condition::build($c->on);
+ $ret[] = array_search($c->type, static::$JOINS) . ' ' . $c->expr
+ . (! empty($c->on)
+ ? ' ON ' . Condition::build($c->on)
+ : ' USING ' . ArrayObj::build($c->using));
}
return implode(' ', $ret);
}