fix 修复 postgres 更新sql语法问题

script/sql/update/postgres/update_5.0-5.1.sql

@@ -20,7 +20,7 @@ create table sys_social
     email              varchar(255)     default ''::varchar,
     avatar             varchar(500)     default ''::varchar,
     access_token       varchar(255)     not null,
-    expire_in          int8             default null::varchar,
+    expire_in          int8             default null,
     refresh_token      varchar(255)     default null::varchar,
     access_code        varchar(255)     default null::varchar,
     union_id           varchar(255)     default null::varchar,
@@ -78,11 +78,11 @@ comment on column  sys_social.del_flag          is '删除标志（0代表存在
 drop table if exists sys_client;
 create table sys_client (
     id                  int8,
-    client_id           varchar(64)   ''::varchar,
-    client_key          varchar(32)   ''::varchar,
-    client_secret       varchar(255)  ''::varchar,
-    grant_type          varchar(255)  ''::varchar,
-    device_type         varchar(32)   ''::varchar,
+    client_id           varchar(64)   default ''::varchar,
+    client_key          varchar(32)   default ''::varchar,
+    client_secret       varchar(255)  default ''::varchar,
+    grant_type          varchar(255)  default ''::varchar,
+    device_type         varchar(32)   default ''::varchar,
     active_timeout      int4          default 1800,
     timeout             int4          default 604800,
     status              char(1)       default '0'::bpchar,
@@ -93,7 +93,7 @@ create table sys_client (
     update_by           int8,
     update_time         timestamp,
     constraint sys_client_pk primary key (id)
-)
+);
 
 comment on table sys_client                         is '系统授权表';
 comment on column sys_client.id                     is '主建';