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Extend date part extraction and date formating functions to support more formats like "quarter", "iso year/week" #3831

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

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

Date: 2015-10-22 08:44:28 +0200
From: Sherzod Mutalov <>
To: Martin van Dinther <<martin.van.dinther>>
Version: -- development
CC: martin.van.dinther

Last updated: 2018-03-29 15:39:25 +0200

Comment 21377

Date: 2015-10-22 08:44:28 +0200
From: Sherzod Mutalov <>

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

MonetDB doesn't support some date part formatting like quarter or iso year/weak. Popular RDBMS includes that functionality (see additional information). For now, as solution we use:
((extract(month from current_timestamp) - 1) / 3 + 1)
expression.

Reproducible: Always

Steps to Reproduce:

  1. select extract(quarter from current_timestamp)
    or
  2. select timestamp_to_str(current_timestamp, '%Q');

Actual Results:

  1. syntax error, unexpected IDENT in: "select extract(quarter"

  2. server crash

Expected Results:

quarter of a date (1-4)

See:

  1. SQL Server: DATEPART(Q, )
  2. PostgreSQL: DATE_PART('quarter', )
  3. Oracle: TO_CHAR(, 'Q')
  4. MySQL: QUARTER()

Comment 25562

Date: 2017-08-10 14:21:35 +0200
From: MonetDB Mercurial Repository <>

Changeset eb347d3c0321 made by Martin van Dinther martin.van.dinther@monetdbsolutions.com in the MonetDB repo, refers to this bug.

For complete details, see https//devmonetdborg/hg/MonetDB?cmd=changeset;node=eb347d3c0321

Changeset description:

Addendum to changeset [https//devmonetdborg/hg/MonetDB?cmd=changeset;node=1523b559564f](https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=https//devmonetdborg/hg/MonetDB?cmd=changeset;node=1523b559564f) 
Added the words quarter and week to the non_reserved_word list to avoid upgrade problems for users which have objects named quarter or week.
This allows me to undo some changes made in pg_regress tests where column quarter or function calls to week or quarter were made.
Also extended test extract_quarter_week_from_date.Bug-3831.sql with tests of new scalar function: quarter(x).
Also updated ODBC driver mapping for scalar function quarter(), which can now map to quarter() directly instead of the workaround using month().
Also moved ChangeLog message to the prooer sql/ChangeLog as this is related only to sql part.

Comment 25563

Date: 2017-08-10 15:20:31 +0200
From: Martin van Dinther <<martin.van.dinther>>

Added support for SQL scalar functions:
quarter ( date_expr ),
quarter ( timestamp_expr ) and
quarter ( timestamptz_expr ).
and for extracting the quarter (number between 1 and 4) from
a date or a timestamp or a timestamp with timezone in SQL:
EXTRACT ( QUARTER FROM my_date_expr ).

Also added support for extracting the week (number between 1 and 53) from
a date or a timestamp or a timestamp with timezone in SQL:
EXTRACT ( WEEK FROM my_date_expr ).

The scalar functions week() and weekofyear() already existed.

Comment 26327

Date: 2018-03-29 15:39:25 +0200
From: @sjoerdmullender

The Mar2018 version has been released.

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