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In most databases, NVARCHAR can be converted to VARCHAR using the CAST or CONVERT function. The syntax varies slightly between different database management systems, but some common examples are:
In SQL Server:
SELECT CAST(N'Hello' AS VARCHAR(10))
In MySQL:
SELECT CONVERT('Hello' USING ASCII)
In PostgreSQL:
SELECT CAST('Hello' AS VARCHAR(10))
It is important to note that when converting from NVARCHAR to VARCHAR, any non-ASCII characters may be lost or converted to a question mark or another symbol, depending on the character encoding used. It is also important to ensure that the destination VARCHAR column is large enough to accommodate the longest NVARCHAR value.