Revert fc3df54eab

code/MSSQLDatabase.php

@@ -614,6 +614,13 @@ class MSSQLDatabase extends SS_Database {
 		// drop the index if it exists
 		$alterCol='';
 
+		// drop *ALL* indexes on a table before proceeding
+		// this won't drop primary keys, though
+		$indexes = $this->indexNames($tableName);
+		foreach($indexes as $indexName) {
+			$alterCol = "\nDROP INDEX \"$indexName\" ON \"$tableName\";";
+		}
+
 		$prefix="ALTER TABLE \"" . $tableName . "\" ";
 
 		// Remove the old default prior to adjusting the column.