sql parsename 函数

https://docs.microsoft.com/en-us/sql/t-sql/functions/parsename-transact-sql?view=sql-server-2017

Syntax：

PARSENAME ( 'object_name' , object_piece )

Arguments

'object_name'
Is the name of the object for which to retrieve the specified object part. object_name is sysname. This parameter is an optionally-qualified object name. If all parts of the object name are qualified, this name can have four parts: the server name, the database name, the owner name, and the object name.

object_piece
Is the object part to return. object_piece is of type int, and can have these values:

1 = Object name

2 = Schema name

3 = Database name

4 = Server name