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Merge pull request #22573 from sqlshep/patch-13
Including support for Azure SQL MI
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docs/relational-databases/data-compression/unicode-compression-implementation.md

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monikerRange: "=azuresqldb-current||>=sql-server-2016||>=sql-server-linux-2017||=azuresqldb-mi-current"
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# Unicode Compression Implementation
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[!INCLUDE [SQL Server Azure SQL Database](../../includes/applies-to-version/sql-asdb.md)]
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[!INCLUDE [SQL Server Azure SQL Database Azure SQL Managed Instance](../../includes/applies-to-version/sql-asdb-asdbmi.md)]
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[!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] uses an implementation of the Standard Compression Scheme for Unicode (SCSU) algorithm to compress Unicode values that are stored in row or page compressed objects. For these compressed objects, Unicode compression is automatic for **nchar(n)** and **nvarchar(n)** columns. The [!INCLUDE[ssDE](../../includes/ssde-md.md)] stores Unicode data as 2 bytes, regardless of locale. This is known as UCS-2 encoding. For some locales, the implementation of SCSU compression in SQL Server can save up to 50 percent in storage space.
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