How To Avoid Divide By Zero Error In Oracle
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NULLIF() To Prevent Divide-By-Zero Errors In SQL By Ben Nadel on October 3, 2007 Tags: SQL Boyan Kostadinov just sent me a cool link
Oracle Nullif
to an article that is the final part in a four part oracle divide by zero exception series that discusses the SQL NULL value. I haven't read the first three parts yet, but there is
Oracle Divide By Zero Function
a really cool tip in the fourth part on using NULLIF() to prevent divide-by-zero errors in a SQL call.The idea here is that, as with any other form of sql divide by null math that I know of, you cannot divide by zero in a SQL call. Therefore, running this code:
2007 - 1:28 pm UTC Category: Database � Version: 8.1.7 Latest Followup You Asked Hi Tom, My problem is handling of zero_divide exception. I'm using INSERT INTO T1 (SELECT... FROM T2) syntax. Tables T1 and T2 are known only at the runtime.
Divisor Is Equal To Zero Oracle
SELECT contains many calculations as per example: SELECT C1/C2,C3+(C4/C5)... FROM T2 I would like to divide by zero error encountered in stored procedure identify rowid of the row raising zero_devide exception. Thank you very much for everything that you done on this site. It is
Nullif Sql
very helpful for me. Best regards. Mladen and we said... select decode( c2, 0, to_number(null), c1/c2 ) will accomplish your goal safely. Use decode to avoid evaluating a zero divide condition. Note: the to_number is not "extra", it https://www.bennadel.com/blog/984-using-nullif-to-prevent-divide-by-zero-errors-in-sql.htm is necessary to avoid implicit conversions to and from strings. Note2: I'm assumging when c2 is zero, the returned value should be "unknown", if it should be zero or some other number, it is OK to return that as well: decode( c2, 0, 0, c1/c2 ) Reviews Write a Review More or less the same problem February 17, 2005 - 9:29 am UTC Reviewer: Gabriel from Portugal My problem is that we have an application https://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:16179197301219 where the end user can introduce a formula, wich will eventually turned into a dynamic sql. The idea is to return a null if the expression encounters a zero-divide expression. Our options are - Use a function to wrap around the expression that would catch the zero-divide exception. I don't know how to solve this. - Parse the expressions the user can introduce. This is difficult to do. Do you know a way to implement the first solution ? Something I could use as follows : SELECT myfunc(C1/C2),myfunc(C3+(C4/C5))... FROM T2 Thank you so much for this and for your books, they have been very helpful. Cheers Gabriel Followup February 17, 2005 - 10:37 am UTC parsing the expression would not help unless the function returns a constant value, in which case -- it would not be much of a function! I'm not liking the idea, before I answer how to do in a function, tell me -- how many of these functions are there? why are we not using a view? how often are they executed? Sounds Dangerous ? February 17, 2005 - 11:10 am UTC Reviewer: Paul from London, UK "My problem is that we have an application where the end user can introduce a formula, wich will eventually turned into a dynamic sql" If I understand that correctly you are takin
shot at without result. —Winston Churchill Run-time errors arise from design faults, coding mistakes, hardware failures, and many other sources. Although you cannot https://docs.oracle.com/cd/B13789_01/appdev.101/b10807/07_errs.htm anticipate all possible errors, you can plan to handle certain kinds of errors meaningful to your PL/SQL program. With many programming languages, unless you disable error checking, a run-time error http://psoug.org/definition/NULLIF.htm such as stack overflow or division by zero stops normal processing and returns control to the operating system. With PL/SQL, a mechanism called exception handling lets you "bulletproof" your program divide by so that it can continue operating in the presence of errors. This chapter contains these topics: Overview of PL/SQL Runtime Error Handling Advantages of PL/SQL Exceptions Summary of Predefined PL/SQL Exceptions Defining Your Own PL/SQL Exceptions How PL/SQL Exceptions Are Raised How PL/SQL Exceptions Propagate Reraising a PL/SQL Exception Handling Raised PL/SQL Exceptions Tips for Handling PL/SQL Errors Overview divide by zero of PL/SQL Compile-Time Warnings Overview of PL/SQL Runtime Error Handling In PL/SQL, an error condition is called an exception. Exceptions can be internally defined (by the runtime system) or user defined. Examples of internally defined exceptions include division by zero and out of memory. Some common internal exceptions have predefined names, such as ZERO_DIVIDE and STORAGE_ERROR. The other internal exceptions can be given names. You can define exceptions of your own in the declarative part of any PL/SQL block, subprogram, or package. For example, you might define an exception named insufficient_funds to flag overdrawn bank accounts. Unlike internal exceptions, user-defined exceptions must be given names. When an error occurs, an exception is raised. That is, normal execution stops and control transfers to the exception-handling part of your PL/SQL block or subprogram. Internal exceptions are raised implicitly (automatically) by the run-time system. User-defined exceptions must be raised explicitly by RAISE statements, which can also raise predefined exceptions. To handle raised exceptions, you write separate routines called exception handlers. After an exception handler runs, the current block stops exe
Code Library PHP Code Library JavaScript Code Library Oracle Terms & Definitions Oracle Error Codes PSOUG Community Blogs Oracle Jobs Board PSOUG Forum Oracle User Group Directory Free Oracle Magazines Online Learning Center PSOUG Presentations Advanced Code Search News and Events Sponsors Page Submit Code Contact Us Looking for the original pages? (formerly called "Morgan's Library") You can find them here. Term: NULLIF Definition: The Oracle NULLIF function is a null handling function which accepts two numeric arguments. If both of the arguments are equal it returns NULL; otherwise it returns the first argument. It is most commonly used for handling the ZERO_DIVIDE exception. Example Syntax: NULLIF(arg1, arg2) where arg1 and arg2 are of the NUMBER datatype. Example Usage: The SQL example below raises a ZERO_DIVIDE exception as it foolishly tries to divide a number by zero. SQL> SELECT 12/0 FROM DUAL; select 12/0 from dual * ERROR at line 1: ORA-01476: divisor is equal to zero The SQL example below handles the exception raised above by using the NULLIF function in the Divisor. SQL> SELECT 12/NULLIF(0,0) FROM DUAL; 12/NULLIF(0,0) -------------- Related Links: Miscellaneous Functions: NULLIF SQLLoader: Example using NULLIF Home : Code Library : Sponsors : Privacy : Terms of Use : Contact Us 185 users online © 2009 psoug.org PSOUG LOGIN Username: Password: Forgot your password?