V_XMLType : xmlType( V_clob) -Use xmlType function to convert CLOB to xmlType. You can not use the XMLDB operators with using CLOB datatype and we have to convert the CLOB datatype to XMLtype. To process the data with using XMLDB package we must require to convert the datatype to XMLtype. The first example i would like to give this because in many real life applications we are using the CLOB datatypes.
Oracle select xml decode how to#
We might have seen some examples of converting the BLOB/CLOB datatypes in XMLtypes.Įxample 1 : How to convert CLOB to XMLtype? In our day to day scenarios we require to perform the multiple xml operations. We will see multiple examples of how to convert, how to select and how to check the data from xml files. In this section I would like to give you the multiple scenarios of processing the XML data with using Oracle PL/SQL through XMLDB package. How to process XML data with Oracle PL/SQL through XMLDB? I will not go in to deep and will prepare separate article for the XML Parsers. We require to run the xml parser and use its different interfaces of XML Parser to read the xml files. XML Parser Location : $ORACLE_HOME/xdk/plsql/parser The first step is to access the XML parser and run the xml parser. There are so many Java based application will generate the data in XML format and there is necessary to process the xml data and give it to other applications or keep it in human readable format. The XML Parsers are important PL/SQL parsers which we are using to process the XML files. How to process XML data with Oracle PL/SQL with multiple scenarios. The article will give information about how to do the xml file processing with multiple scenarios. Oracle has introduced a separate in built package for processing the xml data named XMLDB package. In this article i would like to give you information about the how to process XML data with Oracle PL/SQL with multiple real life examples. This includes the expression, search, and result arguments.In my previous article I have given the examples of how to do performance tuning for PostgreSQL with examples. Question: Is there a limit to the number of arguments that you can have in one DECODE statement? I'm getting an error, "ORA-00939: too many arguments for function".Īnswer: Yes, the maximum number of components that you can have in a DECODE function is 255. If yrs_of_service = 1 and 5 then return 0.06Īnswer: You will need to create a formula that will evaluate to a single number for each one of your ranges.ĭECODE(TRUNC (( yrs_of_service + 3) / 4), 0, 0.04, Question: I need to write a DECODE statement that will return the following: The formula will evaluate to 2, if the supplier_id is between 21 and 30. The formula will evaluate to 1, if the supplier_id is between 11 and 20. The formula will evaluate to 0, if the supplier_id is between 1 and 10. In this example, based on the formula: TRUNC ((supplier_id - 1) / 10 However, you can try to create a formula that will evaluate to one number for a given range, and another number for the next range, and so on.ĭECODE(TRUNC ((supplier_id - 1) / 10), 0, 'category 1', Question: I would like to know if it's possible to use the DECODE function for ranges of numbers, ie 1-10 = 'category 1', 11-20 = 'category 2', rather than having to individually decode each number.Īnswer: Unfortunately, you can not use the DECODE function for ranges of numbers.
The date example above could be modified as follows: LEAST(date1, date2) Helpful Tip #2: One of our viewers suggested using the LEAST function (instead of the DECODE function) as follows: Sales Bonuses DECODE(SIGN(actual-target), -1, 'NO Bonus for you', 0,'Just made it', 1, 'Congrats, you are a winner') The SIGN/DECODE combination is also helpful for numeric comparisons e.g. The date example above could be modified as follows: DECODE(SIGN(date1-date2), 1, date2, date1) Helpful Tip #1: One of our viewers suggested combining the SIGN function with the DECODE function as follows:
The formula below would equal 0, if date1 is greater than date2: (date1 - date2) - ABS(date1 - date2) Otherwise, the DECODE function should return date1.Īnswer: To accomplish this, use the DECODE function as follows: DECODE((date1 - date2) - ABS(date1 - date2), 0, date2, date1) Question: One of our viewers wanted to know how to use the DECODE function to compare two dates (ie: date1 and date2), where if date1 > date2, the DECODE function should return date2.
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