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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:
When the conversion is to datetime, hour, minute, and second values are copied; and the date component is set to '1900-01-01'. When the fractional seconds precision of the time(n) value is greater than three digits, the datetime result will be truncated.