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48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
#coding:utf-8
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"""
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ID: tabloid.pg-13918
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TITLE: Some _TRIVIAL_ queries allow to specify HAVING without group by, and for such
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case one may to get record from EMPTY source rowset(!)
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DESCRIPTION:
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Original issue:
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http://www.postgresql.org/message-id/flat/CAKFQuwYSa5Dzvw8KdxhiUAY+fjbO4DRQ-sDqQXPVexvVoTkvQA@mail.gmail.com#CAKFQuwYSa5Dzvw8KdxhiUAY+fjbO4DRQ-sDqQXPVexvVoTkvQA@mail.gmail.com
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See also http://www.postgresql.org/docs/9.5/interactive/sql-select.html
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===
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The presence of HAVING turns a query into a grouped query even if there is no GROUP BY clause <...>
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Such a query will emit a single row if the HAVING condition is true, zero rows if it is not true.
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===
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FBTEST: functional.tabloid.pg_13918
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"""
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import pytest
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from firebird.qa import *
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db = db_factory()
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test_script = """
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set list on;
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set count on;
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-- This compiles OK and, moreover, outputs one record:
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select 123456789 as "Yeah!" from rdb$database where 1=0 having 1=1;
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select 987654321 as "Waw!!" from rdb$database where 1=0 having 1=2;
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-- Following will NOT compile:
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-- select i from (select 1 i from rdb$database) where i<0 having 1=0;
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"""
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act = isql_act('db', test_script)
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expected_stdout = """
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Yeah! 123456789
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Records affected: 1
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Records affected: 0
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"""
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@pytest.mark.version('>=3.0')
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def test_1(act: Action):
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act.expected_stdout = expected_stdout
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act.execute()
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assert act.clean_stdout == act.clean_expected_stdout
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