![oracle apex sql error 01858 oracle apex sql error 01858](https://3.bp.blogspot.com/-LnNGE8LLpEs/VgQ2X6mj-5I/AAAAAAAAAzY/_sJw_qBxgRM/s1600/sms.png)
WHEN OTHERS THEN - handles all other errorsĮND - exception handlers and block end here INSERT INTO stats (symbol, ratio) VALUES ('XYZ', NULL) WHEN ZERO_DIVIDE THEN - handles 'division by zero' error INSERT INTO stats (symbol, ratio) VALUES ('XYZ', pe_ratio) WHERE symbol = 'XYZ' - might cause division-by-zero error SELECT price / earnings INTO pe_ratio FROM stocks The optional OTHERS handler catches all exceptions that the block does not name specifically. This stops normal execution of the block and transfers control to the exception handlers. If the company has zero earnings, the predefined exception ZERO_DIVIDE is raised. In the example below, you calculate and store a price-to-earnings ratio for a company with ticker symbol XYZ. If there is no enclosing block, control returns to the host environment. After an exception handler runs, the current block stops executing and the enclosing block resumes with the next statement. To handle raised exceptions, you write separate routines called exception handlers. User-defined exceptions must be raised explicitly by RAISE statements, which can also raise predefined exceptions. Internal exceptions are raised implicitly (automatically) by the run-time system. That is, normal execution stops and control transfers to the exception-handling part of your PL/SQL block or subprogram. When an error occurs, an exception is raised. Unlike internal exceptions, user-defined exceptions must be given names. For example, you might define an exception named insufficient_funds to flag overdrawn bank accounts. You can define exceptions of your own in the declarative part of any PL/SQL block, subprogram, or package. The other internal exceptions can be given names. Some common internal exceptions have predefined names, such as ZERO_DIVIDE and STORAGE_ERROR. Examples of internally defined exceptions include division by zero and out of memory. Exceptions can be internally defined (by the run-time system) or user defined.
![oracle apex sql error 01858 oracle apex sql error 01858](https://us.v-cdn.net/6032257/uploads/jive_attachments/3/9/4/39492654egami.png)
In PL/SQL, a warning or error condition is called an exception. This chapter discusses the following topics: Overview of PL/SQL Error Handling Advantages of PL/SQL Exceptions 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 of PL/SQL Error Handling With PL/SQL, a mechanism called exception handling lets you "bulletproof" your program so that it can continue operating in the presence of errors. With many programming languages, unless you disable error checking, a run-time error such as stack overflow or division by zero stops normal processing and returns control to the operating system. Although you cannot anticipate all possible errors, you can plan to handle certain kinds of errors meaningful to your PL/SQL program. Run-time errors arise from design faults, coding mistakes, hardware failures, and many other sources.
![oracle apex sql error 01858 oracle apex sql error 01858](http://4.bp.blogspot.com/-SG-Of3I1dQQ/U6SXutRbkJI/AAAAAAAAHzo/TqjuDXDQVK4/s1600/Screen+Shot+2014-06-20+at+22.20.27.png)
There is nothing more exhilarating than to be shot at without result.