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UCASE function (MySQL)
UHIGHSURR function
UID function (Oracle)
UInt parameter object type (ADO.NET)
ULOWSURR function
unary operators 2nd
UNCOMPRESS function (MySQL)
UNHEX function (MySQL)
UNICHAR datatype (Sybase adaptive server)
UNICODE function
     SQL Server
UNION set operator
     DB2
     keywords
     MySQL
     Oracle
     platform support for
     PostgreSQL
     programming tips
     rules
     SQL Server
     SQL2003 syntax
UNIQUE constraints
UNIQUEIDENTIFIER datatype
     platform comparison
     SQL Server 2nd
UNISTR function (Oracle)
UNIVARCHAR datatype (Sybase adaptive server)
UNIX_TIMESTAMP function (MySQL)
Unspecified isolation level (Transaction object (ADO.NET))
UPDATE statement
     DB2
     keywords
     MySQL
     operators and 2nd
     Oracle
     platform support for
     PostgreSQL
     programming tips
     rules
     SQL Server
     SQL2003 syntax
UPDATEXML function (Oracle)
UPPER function
URLs
     MySQL
     open source
     Oracle
     PostgreSQL
     SQL Server
UROWID datatype
     Oracle
     platform comparison
USCALAR function
user
USER( ) function (MySQL)
USER_ID function (SQL Server)
USER_NAME function (SQL Server)
USERENV function (Oracle)

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