Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Cannot use expressions in GROUP BY clause #3832

Closed
monetdb-team opened this issue Nov 30, 2020 · 0 comments
Closed

Cannot use expressions in GROUP BY clause #3832

monetdb-team opened this issue Nov 30, 2020 · 0 comments

Comments

@monetdb-team
Copy link

@monetdb-team monetdb-team commented Nov 30, 2020

Date: 2015-10-22 09:13:12 +0200
From: Sherzod Mutalov <>
To: SQL devs <>
Version: 11.21.5 (Jul2015)
CC: g.ozolins, jspeis, martin.van.dinther, @PedroTadim, @yzchang

Last updated: 2019-04-30 12:36:03 +0200

Comment 21378

Date: 2015-10-22 09:13:12 +0200
From: Sherzod Mutalov <>

User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0
Build Identifier:

Cannot use SQL expressions with GROUP BY clause, which causes error. Similar query works on SQL Server, PostgreSQL and MySQL

Reproducible: Always

Steps to Reproduce:

Execute next statements:

  1. CREATE TABLE test("State" string, "Sales" double);
  2. INSERT INTO test VALUES('Texas', 125);

SELECT LEFT("State", 3) AS "State",
SUM("Sales") AS "Sales"
FROM test
GROUP BY LEFT("State", 3);

Actual Results:

syntax error, unexpected LEFT in: "select left("State", 3) as "State",
sum("Sales") as "Sales"
from test
group by l"

Expected Results:

+-------+--------------------------+
| State | Sales |
+=======+==========================+
| Tex | 450 |
+-------+--------------------------+

MonetDB version:
MonetDB 5 server v11.21.5 "Jul2015"
Serving database 'demo', using 4 threads
Compiled for x86_64-pc-winnt/64bit with 64bit OIDs dynamically linked
Found 15.916 GiB available main-memory.
Copyright (c) 1993-July 2008 CWI.
Copyright (c) August 2008-2015 MonetDB B.V., all rights reserved
Visit http://www.monetdb.org/ for further information
Listening for connection requests on mapi:monetdb://127.0.0.1:50000/
MonetDB/GIS module loaded
Start processing logs sql/sql_logs version 52200
Start reading the write-ahead log 'sql_logs\sql\log.12'
Finished reading the write-ahead log 'sql_logs\sql\log.12'
Finished processing logs sql/sql_logs
MonetDB/SQL module loaded

Comment 21379

Date: 2015-10-22 09:16:20 +0200
From: Sherzod Mutalov <>

Read steps to reproduce as below:

Execute next statements:

  1. CREATE TABLE test("State" string, "Sales" double);
  2. INSERT INTO test VALUES('Texus', 200);
  3. INSERT INTO test VALUES('Texas', 250);

SELECT LEFT("State", 3) AS "State",
SUM("Sales") AS "Sales"
FROM test
GROUP BY LEFT("State", 3);

Comment 21380

Date: 2015-10-22 11:56:42 +0200
From: @yzchang

This is not a bug, but a missing feature. A.f.a.I.k., MonetDB doesn't support expressions in GROUP BY yet. It only support references to columns. Changed this report into "enhancement".

Comment 21381

Date: 2015-10-22 13:03:42 +0200
From: Sherzod Mutalov <>

What a pity, so I have to pervert queries. Hopefully this feature will be added in the next release.

Comment 21462

Date: 2015-11-05 12:53:49 +0100
From: Martin van Dinther <<martin.van.dinther>>

There are some workarounds for this:

-- use a subquery in the FROM-clause:
SELECT "State3", SUM("Sales") AS "Sales"
FROM (SELECT LEFT("State", 3) AS "State3", "Sales" FROM test) AS test
GROUP BY "State3";

-- use a view to extend the table with the expression colum(s) once
CREATE VIEW test_vw AS
SELECT LEFT("State", 3) AS "State3", "State", "Sales" FROM test;
-- and next query the view instead of the table
SELECT "State3", SUM("Sales") AS "Sales"
FROM test_vw
GROUP BY "State3";

Hope this helps.

Comment 22035

Date: 2016-04-14 12:11:36 +0200
From: Martin van Dinther <<martin.van.dinther>>

You can also use the column alias in the GROUP BY (and also in HAVING).
So a simpler workaround is:
SELECT LEFT("State", 3) AS "StateFirst3chars", SUM("Sales") AS "Sales"
FROM test
GROUP BY "StateFirst3chars";

Comment 22191

Date: 2016-06-02 15:28:03 +0200
From: Gatis Ozolins <<g.ozolins>>

This is also issue for us, where BI tools are generating SQL

Comment 25081

Date: 2017-03-02 16:15:26 +0100
From: MonetDB Mercurial Repository <>

Changeset 3d3a3776b749 made by Martin van Dinther martin.van.dinther@monetdbsolutions.com in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=3d3a3776b749

Changeset description:

Adding missing test script for old bug #3832.
It would be nice if support for groupby_on_column_expressions could be implemented.

Comment 26404

Date: 2018-04-23 22:03:11 +0200
From: jspeis

would be great to see this feature added!

Comment 26741

Date: 2018-12-20 16:35:53 +0100
From: @PedroTadim

This feature will be available in the next feature release.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Projects
None yet
Linked pull requests

Successfully merging a pull request may close this issue.

None yet
1 participant