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The native Oracle datatypes of DATE, TIMESTAMP, and INTERVAL are closely related. The DATE and TIMESTAMP types store fixed date/times with varying degrees of precision. The INTERVAL type is used to store an amount of time, such as 8 hours or 30 days, easily. The result of subtracting two timestamps might be an interval, the result of adding an interval of 8 hours to a TIMESTAMP results in a new TIMESTAMP that is 8 hours later. The DATE datatype has been part of Oracle for many releases as far back as my experience with Oracle goes, which means at least back to version 5 and probably before. The TIMESTAMP and INTERVAL types are relative newcomers to the scene by comparison, as they were introduced with Oracle9i Release 1. For this simple reason, you will find the DATE datatype to be the most prevalent type for storing date/time information. But many new applications are using the TIMESTAMP type for two reasons: it has support for fractions of seconds (the DATE type does not) and it has support for time zones (something the DATE type also does not have). We ll take a look at each type after discussing DATE/TIMESTAMP formats and their uses.

You can t enter text in the blank row, but you can manually format the row for example, add a fill Tip

I am not going to attempt to cover all of the DATE, TIMESTAMP, and INTERVAL formats here. This is well covered in the Oracle SQL Reference manual, which is freely available to all. A wealth of formats is available to you, and a good understanding of what they are is vital. It is strongly recommended that you investigate them. I d like to discuss what the formats do here, as there are a great many misconceptions surrounding this topic. The formats are used for two things: To format the data on the way out of the database in a style that pleases you To tell the database how to convert an input string into a DATE, TIMESTAMP, or INTERVAL

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And that is all. The common misconception I ve observed over the years is that the format used somehow affects what is stored on disk and how the data is actually saved. The format has no effect at all on how the data is stored. The format is only used to convert the single binary format used to store a DATE into a string or to convert a string into the single binary format that is used to store a DATE. The same is true for TIMESTAMPs and INTERVALs. My advice on formats is simply this: use them. Use them when you send a string to the database that represents a DATE, TIMESTAMP, or INTERVAL. Do not rely on default date formats defaults can and probably will at some point in the future be changed by someone.

Your queries are issued using SQLiteDatabase::compile(). This function can process a string containing multiple SQL statements. It returns a VM (virtual machine) object that holds all the statements.

Note Refer back to 1 Developing Successful Oracle Applications for a really good security reason to

color to visually separate the items, or you can format the blank rows as part of a PivotTable Style.

never use to_char/to_date without an explicit format. In that chapter, I described a SQL injection attack that was available to an end user simply because the developer forgot to use an explicit format. Additionally, performing date operations without using an explicit date format can and will lead to incorrect answers. In order to appreciate this, just tell me what date this string represents: 01-02-03 . Whatever you say it represents, I ll tell you that you are wrong. Never rely on defaults!

If you rely on a default date format and it changes, your application may be negatively affected It might raise an error back to the end user if the date cannot be converted, have a serious security flaw or, as bad, it might silently insert the wrong data Consider the follow INSERT statement, which relies on a default date mask: Insert into t ( date_column ) values ( '01/02/03' ); Suppose the application was relying on a default date mask of DD/MM/YY to be in place That would be February 1, 2003 (assuming that code was executed after the year 2000, but we ll visit the implications of that in a moment) Now, say someone decides the correct date format should be MM/DD/YY All of a sudden, that previous date changes to January 2, 2003 Or someone decides YY/MM/DD is right, and now you have February 3, 2001.

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