USING HINTS IN ORACLE PLSQL

Next: 21.5 OCI Service Routines
21.4 Mapping Parameters
Consider for a moment the problems of exchanging data between PL/SQL and C. PL/SQL has its own set of datatypes that are only somewhat similar to those you find in 3GLs. PL/SQL variables can be NULL and subject to three-valued trut[r]

END display; END array;
10.9.5 Optimizing Foreign Key Lookups with PL/SQL Tables
Something you'll do again and again in your client-server applications is look up the name or description of a foreign key from a database table that is resident on the server. This lookup often occurs, fo[r]

When should you use standard SQL to accomplish your task and when should you rely on PL/SQL loops? Sometimes the choice is clear: if you do not need to interact with the database, then there is clearly no need for SQL. In addition, SQL can't always provide the necessary flexibility to get t[r]

[1] If you do so, in fact, you will have declared your own local exception. It will not be raised when the internal error with that name occurs. Avoid declaring an exception with the same name as a predefined exception.
Here is an example of how you might use the exceptions table. Suppos[r]

● The expression will be evaluated and used as the row number:
keyword_list_table (last_row + 15) := 'ELSE';
10.5.2 Referencing an Undefined Row
As I've mentioned, a key difference between arrays and PL/SQL tables is that a row in a PL/SQL table does not exist until you assign a[r]

Câu lệnh của SQL*Plus Khác biệt giữa lệnh SQL và SQL*Plus SQL Là ngôn ngữ để giao tiếp với Oracle Server trong việc truy xuất dữ liệu Câu lệnh dựa trên bộ ký tự chuẩn ASCII Thao tác trên[r]

Next: 15.10 Go Forth and Modularize!
15.9 Forward Declarations
PL/SQL is rather fussy about its requirement that you declare a variable, cursor, or module before you use it in your code. Otherwise, how can PL/SQL be sure that the way you are using the object is appropriate? Since[r]

END; END;
END;
Here, the dm_convert function uses nested anonymous blocks, each with its own exception section, to trap a date conversion failure and pass it on to the next format. The sequence and variety of masks used dictate the range of valid user input and the precedence with w[r]

4.2.5 The Date-Time Datatype
Most of our applications require the storage and manipulation of dates and times. Dates are quite complicated: not only are they highly-formatted data, but there are myriad rules for determining valid values and valid calculations (leap days and years, national and co[r]

How can you best learn PL/SQL? The usual way is to struggle with the software tool and, through trial and error, discover the best implementation techniques. With PL/SQL, a slow and uncertain process is made worse by several factors:
● PL/SQL is still a relatively new language; there are[r]

Identifiers are the handles for objects in your program. Be sure to name your objects carefully, so the names describe the objects and their uses. Avoid identifier names like X1 and temp; they are too ambiguous to mean anything to you or anyone else reading your code.
2.2.1 Reserved Words[r]

CURRENT OF, %TYPE, and %ROWTYPE declaration attributes, cursor FOR loops, local
modularization, and other PL/SQL language constructs can have a big impact on reducing the pain you may experience when you maintain your Oracle-based applications.
Let's see how this clause would improve th[r]

If the error does not yield itself quite that easily, you still have lots to gain from the perspective of another person who (a) did not write the code and has no subconscious assumptions or biases about the code, and (b) isn't mad at the program.
Other benefits accrue from asking for help. You[r]

Parameters in stored procedures, as well as the RETURN datatype of stored functions, can only have one of these datatypes if they are to be used by Oracle Forms. This rule applies both to standalone and package modules. Remember: when you work in a Oracle Developer/2000[r]

structures located in your own Program Global Area (PGA) is much, much faster than going through the SGA -- even if the data you want is resident in shared memory.
This tip will come in handy most when you find that your application needs to perform multiple lookups which do[r]

Local modules are very handy ways to "normalize" redundant code inside a program. If you perform the same calculation over and over again in a module, don't hardcode the calculation repeatedly. Instead, place it in its own function or procedure and then call that module. The[r]

accessible means of debugging your PL/SQL Version 2 programs. DBMS_OUTPUT is also the package you will use to generate reports from PL/SQL scripts run in SQL*Plus.
C.9.1 The DISABLE procedure
The DISABLE procedure disables all calls to the DBMS_OUTPUT package (except for ENABLE, describ[r]

ADD_MONTHS the way it works by default. At this site, if I am on the 28th day of February and shift forward a month, I need to land on the 28th of March -- not the 31st of March. What's a programmer to do?
The best solution is to write your own version of ADD_MONTHS that performs the way you wa[r]

TRANG 1 _PAST PERFECT, PAST PERFECT_ _CONTINUOUS AND PAST SIMPLE_ _ACTIVITY ONE: WRITE COMPLETE AND MEANINGFUL SENTENCES USING THE FOLLOWING HINTS USING THE_ _VERBS IN BRACKETS.. PAST PE[r]

Activity One: Write complete and meaningful sentences using the following hints using the verbs in brackets1. (Past perfect simple or continuous or Past simple).[r]