week
BigQuery
Db2 (LUW)
MariaDB
MySQL
Oracle DB
PostgreSQL
SQL Server
SQLite
2005
2007
2009
2011
2013
2015
2017
2019
2021
⊘ 3.5.7 - 3.41.0
⊘ 2008R2 - 2022
⚠ 8.3 - 15
b
c
⊘ 11gR1 - 21c
⚠ 5.0 - 8.0.32
a
⚠ 5.1 - 10.11
a
⚠ 11.5.7 - 11.5.8
b
e
⚡ 11.5.6
d
e
⚠ 11.1 - 11.5.5
d
⊘ 9.7 - 10.5
⚠ 2.0
c
⚠ 2.0
a
Sunday-based weeks with first Sunday in year
ISO 8601 week date (year’s first Thursday)
Use
extract(isoyear)
for the corresponding year
Buggy? Jan 1 seems to be always week 1
Buggy! E.g. 2005-01-01 till 2005-01-08 all belong to week 1 (Eight days a week)