diff --git a/tests/pytest/query/filterCombo.py b/tests/pytest/query/filterCombo.py
index c25b6156b85484096723bb74ba4e8e48c2adad45..c9c7ade73eece9a33ae99177dc680463e22d2701 100644
--- a/tests/pytest/query/filterCombo.py
+++ b/tests/pytest/query/filterCombo.py
@@ -49,7 +49,8 @@ class TDTestCase:
         tdSql.error("select * from db.st where ts > '2020-05-13 10:00:00.002' OR tagtype < 2")
 
         # illegal condition
-        tdSql.error("select * from db.st where ts != '2020-05-13 10:00:00.002' OR tagtype < 2")
+        tdSql.error("select * from db.st where ts != '2020-05-13 10:00:00.002' OR tagtype < 2")        
+        tdSql.error("select * from db.st where tagtype <> 1 OR tagtype < 2")
 
     def stop(self):
         tdSql.close()
diff --git a/tests/pytest/query/queryError.py b/tests/pytest/query/queryError.py
index d0515ef34dd14ba5b78c43c7023622f9978a319e..95924f48cc062b3756ab5e80fb72b45f707f8939 100644
--- a/tests/pytest/query/queryError.py
+++ b/tests/pytest/query/queryError.py
@@ -41,13 +41,12 @@ class TDTestCase:
             ('2020-05-13 10:00:00.002', 3, 'third') dev_002 VALUES('2020-05-13 10:00:00.003', 1, 'first'), ('2020-05-13 10:00:00.004', 2, 'second'),
             ('2020-05-13 10:00:00.005', 3, 'third')""")
 
-        """Error expected here, but no errors
+        
         # query first .. as ..
         tdSql.error("select first(*) as one from st")    
 
         # query last .. as ..
-        tdSql.error("select last(*) as latest from st")
-        """ 
+        tdSql.error("select last(*) as latest from st")        
 
         # query last row .. as ..
         tdSql.error("select last_row as latest from st") 
diff --git a/tests/pytest/query/queryNormal.py b/tests/pytest/query/queryNormal.py
index 3ca9c1d1357de6de3eb63347a2a104fd947a3e66..442661f72a4510e9d311ee38bbc16a204bf71670 100644
--- a/tests/pytest/query/queryNormal.py
+++ b/tests/pytest/query/queryNormal.py
@@ -31,14 +31,22 @@ class TDTestCase:
         tdSql.execute("create table stb1 (ts timestamp, c1 int, c2 float) tags(t1 int, t2 binary(10), t3 nchar(10))")
         tdSql.execute("insert into tb1 using stb1 tags(1,'tb1', '表1') values ('2020-04-18 15:00:00.000', 1, 0.1), ('2020-04-18 15:00:01.000', 2, 0.1)")
         tdSql.execute("insert into tb2 using stb1 tags(2,'tb2', '表2') values ('2020-04-18 15:00:02.000', 3, 2.1), ('2020-04-18 15:00:03.000', 4, 2.2)")        
-
-        # join 2 tables -- bug exists
-        # tdSql.query("select * from tb1 a, tb2 b where a.ts = b.ts")
-        # tdSql.checkRows(1)
+        
+        # inner join --- bug 
+        tdSql.query("select * from tb1 a, tb2 b where a.ts = b.ts")
+        tdSql.checkRows(1)
 
         # join 3 tables -- bug exists
-        # tdSql.query("select stb_t.ts, stb_t.dscrption, stb_t.temperature, stb_p.id, stb_p.dscrption, stb_p.pressure,stb_v.velocity from stb_p, stb_t, stb_v where stb_p.ts=stb_t.ts and stb_p.ts=stb_v.ts and stb_p.id = stb_t.id")
+        tdSql.query("select stb_t.ts, stb_t.dscrption, stb_t.temperature, stb_p.id, stb_p.dscrption, stb_p.pressure,stb_v.velocity from stb_p, stb_t, stb_v where stb_p.ts=stb_t.ts and stb_p.ts=stb_v.ts and stb_p.id = stb_t.id")
         
+        # query show stable
+        tdSql.query("show stables")
+        tdSql.checkRows(1)
+
+        # query show tables
+        tdSql.query("show table")
+        tdSql.checkRows(2)
+
         # query count
         tdSql.query("select count(*) from stb1")
         tdSql.checkData(0, 0, 4)
@@ -51,6 +59,10 @@ class TDTestCase:
         tdSql.query("select last(*) from stb1")
         tdSql.checkData(0, 1, 4)
 
+        # query last_row 
+        tdSql.query("select last_row(*) from stb1")
+        tdSql.checkData(0, 1, 4)
+
         # query as
         tdSql.query("select t2 as number from stb1")
         tdSql.checkRows(2)
@@ -63,6 +75,10 @@ class TDTestCase:
         tdSql.query("select last(*) as end from stb1")
         tdSql.checkData(0, 1, 4)
 
+        # query last_row ... as
+        tdSql.query("select last_row(*) as end from stb1")
+        tdSql.checkData(0, 1, 4)
+
         # query group .. by
         tdSql.query("select sum(c1), t2 from stb1 group by t2")
         tdSql.checkRows(2)
@@ -75,6 +91,34 @@ class TDTestCase:
         tdSql.query("select * from stb1 limit 2 offset 3")
         tdSql.checkRows(1)
 
+        # query ... alias for table ---- bug
+        tdSql.query("select t.ts from tb1 t")
+        tdSql.checkRows(2)       
+
+        # query ... tbname
+        tdSql.query("select tbname from stb1")
+        tdSql.checkRows(2)
+
+        # query ... tbname count  ---- bug
+        tdSql.query("select count(tbname) from stb1")
+        tdSql.checkRows(2)
+
+        # query ... select database ---- bug
+        tdSql.query("SELECT database()")
+        tdSql.checkRows(1)
+
+        # query ... select client_version ---- bug
+        tdSql.query("SELECT client_version()")
+        tdSql.checkRows(1)
+
+        # query ... select server_version ---- bug
+        tdSql.query("SELECT server_version()")
+        tdSql.checkRows(1)
+
+        # query ... select server_status ---- bug
+        tdSql.query("SELECT server_status()")
+        tdSql.checkRows(1)
+
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)