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In Oracle, TO_CHAR function converts a datetime value (DATE, TIMESTAMP data types i.e.) to a string using the specified format.In. Server, you can use CONVERT or CAST functions to convert a datetime value (DATETIME, DATETIME2 data types i.e.) to a string.Oracle :efault Format. In Oracle, the default format of a datetime string depends on the NLS_DATE_FORMAT session variable: Oracle : In. Server, the default format is Mon DD YYYY HH12:MI : SQL Server : Note that. Server CAST can convert with the default format only.
TO_TIMESTAMP. TO_TIMESTAMP converts char of CHAR, VARCHAR2, NCHAR, or NVARCHAR2 datatype to a value of TIMESTAMP datatype. The optional fmt specifies the format of char. If you omit fmt, then char must be in the default format of the TIMESTAMP datatype, which is determined by the NLS_TIMESTAMP_FORMAT initialization parameter. The optional 'nlsparam' argument has the same purpose in this function as in the TO_CHAR function for date conversion.