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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.
Truncate to Hour. If you specify 'HH24' or 'HH' unit in Oracle TRUNC, the datetime is truncated to hour (minutes and seconds are set to 00:00): Oracle: In. Server, you can convert a datetime to VARCHAR(13) using style 120 to get the 'YYYY-MM-DD HH24' format, add ':00:00', and convert to DATETIME or DATETIME2: