Pre Merge pull request !42 from 樊冲/fix-bug-fanchong

数据库/2.7.4/更新-postgresql-kingbase-2.7.4.sql

@@ -41,4 +41,4 @@ ALTER table wvp_media_server ADD COLUMN IF NOT EXISTS mp4_ssl_port integer;
 ALTER table wvp_device_channel ADD COLUMN IF NOT EXISTS enable_broadcast integer default 0;
 ALTER table wvp_device_channel ADD COLUMN IF NOT EXISTS map_level integer default 0;
 ALTER table wvp_common_group ADD COLUMN IF NOT EXISTS alias varchar(255) default null;
-ALTER table wvp_stream_proxy DROP COLUMN IF EXISTS enable_remove_none_reader;
+ALTER table wvp_stream_proxy DROP COLUMN IF NOT EXISTS enable_remove_none_reader;