BigQuery: How to convert Year to Decade? - google-bigquery

Question

In this great article, I found the way to convert Year into Decade, but it looks too verbose to me!
Is there better way to do this?
#standardSQL
WITH data AS (
SELECT '1921' AS YEAR UNION ALL
SELECT '1932' UNION ALL
SELECT '1943' UNION ALL
SELECT '1954' UNION ALL
SELECT '1985' UNION ALL
SELECT '2006' UNION ALL
SELECT '2017' UNION ALL
SELECT '2018'
)
SELECT
YEAR,
CASE
WHEN YEAR LIKE "192%" THEN "20S"
WHEN YEAR LIKE "193%" THEN "30S"
WHEN YEAR LIKE "194%" THEN "40S"
WHEN YEAR LIKE "195%" THEN "50S"
WHEN YEAR LIKE "196%" THEN "60S"
WHEN YEAR LIKE "197%" THEN "70S"
WHEN YEAR LIKE "198%" THEN "80S"
WHEN YEAR LIKE "199%" THEN "90S"
WHEN YEAR LIKE "200%" THEN "2000S"
WHEN YEAR LIKE "201%" THEN "2010S"
END AS DECADES
FROM data
-- ORDER BY YEAR

Answer 1

To "extract" Decade from Year - REGEXP_REPLACE function can be used as in example below
#standardSQL
WITH data AS (
SELECT '1921' AS YEAR UNION ALL
SELECT '1932' UNION ALL
SELECT '1943' UNION ALL
SELECT '1954' UNION ALL
SELECT '1985' UNION ALL
SELECT '2006' UNION ALL
SELECT '2017' UNION ALL
SELECT '2028'
)
SELECT
YEAR,
REGEXP_REPLACE(YEAR, r'(?:19)(\d)\d|(20\d)\d', '\\1\\20s') AS DECADES
FROM data
-- ORDER BY YEAR