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TO_CHAR - Convert Datetime to String - Oracle to SQL Server Migration. In Oracle, TO_CHAR function converts a datetime value (DATE, TIMESTAMP data types i.e.) to a string using the specified format. In SQL Server, you can use CONVERT or CAST functions to convert a datetime value (DATETIME, DATETIME2 data types i.e.) to a string. Oracle:
ISDATE (Transact-SQL) Returns 1 if the expression is a valid date, time, or datetime value; otherwise, 0. ISDATE returns 0 if the expression is a datetime2 value. For an overview of all Transact-SQL date and time data types and functions, see Date and Time Data Types and Functions (Transact-SQL). Note that the range for datetime data is 1753-01-01 through 9999-12-31, while the range for date data is 0001-01-01 through 9999-12-31.