Oracle if updating field
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You need to keep track of when events occurred, when people were born, and much more.As a result, you will quite often need to A date is also a considerably more complex datatype than a string or a number.
Now that you have a solid foundation in working with key datatypes such as strings, numbers, and dates, I will switch focus in the next article of this series to an in-depth introduction to exceptions: how they can be raised and how you can handle them. Here, you're specifying in a row what fields you want updated, and then using a multi-column SELECT to provide those values. I had no idea that SQL could do this until I saw a friend of mine do this in one of his programs.A default installation of Oracle Database sets the default DATE format to DD-MON-YYYY.The default TIMESTAMP format includes both the date offset and the time zone offset. As with TO_CHAR for numbers, you use another version of the TO_CHAR function to convert a date or a time stamp to a string.It has multiple parts (year, month, day, hour, and so on), and there are many rules about what constitutes a valid date.
This article gives you all the information you need in order to begin working with dates in your PL/SQL programs.
Provide the string and Oracle Database returns a date or a time stamp, using the default format mask for the session: You should not assume that the literal value you provide in your call to TO_DATE matches the default format. Instead, always provide a format mask when converting strings to dates, as in Date truncation.
Use the TRUNC built-in function to truncate a date to the specified unit of measure.
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This article focuses on the core DATE and TIMESTAMP types, along with the most commonly used built-in functions. With such an abundance of riches, how do you decide which of these date-and-time datatypes to use?