This article was previously published under Q155723
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If dual byte character set (DBCS) data is too long to fit into a char or varchar column, the data is truncated to fit into the column. If Microsoft SQL Server uses a DBCS code page and this truncation happens right in the middle of a double-byte character, the whole double-byte character is discarded.
The following scripts demonstrate this truncation. It is assumed that the code page that applies here is a DBCS code page.
CREATE TABLE test( col1 char (10), col1 varchar (10))GO/* Let D represent a double character. */ /* Let L represent the leading byte. */ /* Let T represent the trailing byte. */ /* Let S represent a single character. */ /* Let s represent space (ASCII 20). */ INSERT test VALUES ("SDDDDD", "SDDDDD")GOSELECT * FROM testGO
Because the truncated string is shorter than the maximum length, the charcolumn that does not allow a null value and the char variable is paddedwith trailing blanks while the varchar column will not store trailing blanks.