SQL ServerでBASE64でデコードする

SELECT
CONVERT
(
VARCHAR(MAX),
CAST('' AS XML).value('xs:base64Binary(sql:column("BASE64_COLUMN"))', 'VARBINARY(MAX)')
) AS RESULT
FROM
(
SELECT 'cm9sZToxIHByb2R1Y2VyOjEyIHRpbWVzdGFtcDoxNDY4NjQwMjIyNTcxMDAwIGxhdGxuZ3tsYXRpdHVkZV9lNzo0MTY5ODkzOTQgbG9uZ2l0dWRlX2U3Oi03Mzg5NjYyMTB9IHJhZGl1czoxOTc2NA==' AS BASE64_COLUMN
) A

もし、taというテーブルでcol1にデコードしたい場合は以下でデコードできた

select
id,
col1,
CONVERT
(
VARCHAR(MAX),
CAST('' AS XML).value('xs:base64Binary(sql:column("col1"))', 'VARBINARY(MAX)')
) AS RESULT
from
ta

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