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-- (Comment) (Transact-SQL)
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[ ] (Wildcard - Character(s) to Match) (Transact-SQL)
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binary and varbinary (Transact-SQL)
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geography (Transact-SQL)
geometry (Transact-SQL)
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CRYPT_GEN_RANDOM (Transact-SQL)

SQL Server 2008

Returns a cryptographic random number generated by the Crypto API (CAPI). The output is a hexadecimal number of the specified number of bytes.

Topic link iconTransact-SQL Syntax Conventions

Copy 

CRYPT_GEN_RANDOM ( length [ , seed ] )
length

The length of the number being created. Maximum is 8000. length is type int.

seed

Optional data to use as a random seed. There must be at least length bytes of data. seed is varbinary(8000).

varbinary(8000)

This function is public and does not require any special permissions.

A. Generating a random number

The following example generates a random number 50 bytes long.

Copy 
SELECT CRYPT_GEN_RANDOM(50) ;

The following example generates a random number 4 bytes long using a 4-byte seed.

Copy 
SELECT CRYPT_GEN_RANDOM(4, 0x25F18060) ;
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