Created
August 28, 2021 20:57
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XML Type directive
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/* xml variable, no TYPE directive */ | |
DECLARE @xmlNoType xml | |
SET @xmlNoType = | |
( | |
SELECT * | |
FROM sys.all_objects | |
FOR XML PATH(''), ROOT ('Document') | |
) | |
SELECT (DATALENGTH(@xmlNoType) / 1024.0) / 1024. AS SizeMB | |
GO | |
/* xml variable, TYPE directive */ | |
DECLARE @xmlType xml | |
SET @xmlType = | |
( | |
SELECT * | |
FROM sys.all_objects | |
FOR XML PATH(''), ROOT ('Document'), TYPE | |
) | |
--SELECT (DATALENGTH(@xmlType) / 1024.0) / 1024. AS SizeMB | |
GO | |
/* varchar(MAX) variable, no TYPE directive */ | |
DECLARE @varchar varchar(MAX) | |
SET @varchar = | |
( | |
SELECT * | |
FROM sys.all_objects | |
FOR XML PATH(''), ROOT ('Document') | |
/* | |
Cannot use TYPE: | |
Implicit conversion from data type xml to varchar(max) is not allowed. Use the CONVERT function to run this query. | |
*/ | |
) | |
SELECT (DATALENGTH(@varchar) / 1024.0) / 1024. AS SizeMB | |
GO | |
/* nvarchar(MAX) variable, no TYPE directive */ | |
DECLARE @nvarchar nvarchar(MAX) | |
SET @nvarchar = | |
( | |
SELECT * | |
FROM sys.all_objects | |
FOR XML PATH(''), ROOT ('Document') | |
/* | |
Cannot use TYPE: | |
Implicit conversion from data type xml to nvarchar(max) is not allowed. Use the CONVERT function to run this query. | |
*/ | |
) | |
SELECT (DATALENGTH(@nvarchar) / 1024.0) / 1024. AS SizeMB | |
GO | |
/* | |
XML size 0.59 MB | |
varchar(max) size 0.90 MB | |
nvarchar(max) size 1.80 MB | |
*/ |
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