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Using NOT NULLBesides assigning an initial value, the declarations can impose the NOT NULL constraint, as the example below shows:acct_id INTEGER(4) NOT NULL := 9999;You cannot assign nulls to the variable define as NOT NULL. If you attempt the PL/SQL raises predefined exception VALUE_ERROR. The NOT NULL constraint should be followed by the initialization clause. For e.g. the declaration below is illegal:acct_id INTEGER(5) NOT NULL; -- illegal; not initializedRemember that the subtypes NATURALN and POSITIVEN are predefined as NOT NULL. For illustration, the declarations below are equivalent:emp_count NATURAL NOT NULL := 0;emp_count NATURALN := 0;In the NATURALN and POSITIVEN declarations, the type specifier should be followed by an initialization clause. Or else, you get a compilation error. For e.g. the declaration below is illegal:line_items POSITIVEN; -- illegal; not initialized
I have a Pascal Source file that needs to be compiled into a Service. In addition, there are various functions (Pascal Procedures I guess) that need to be created to Read and Write
Short-Circuit Evaluation When computing a logical expression, the PL/SQL uses short-circuit evaluation. That is, the PL/SQL stops computing the expression as soon as the result
Using the Collection Methods The collection methods below help to generalize the code and make collections easier to use and also make your applications easier to maintain:
INSERT Command in SQL Loosely speaking, INSERT takes the rows of a given source table and adds them to the specified target table, retaining all the existing rows in the targ
Using DEFAULT You can use the keyword DEFAULT rather than that of the assignment operator to initialize the variables. For e.g. the declaration blood_type CHAR := ’O’; it can b
Application to Export Excel Data to MSSQL Server table I am having a table available in excel format and features the subsequent: - Some text is in Arabic (e.g. UTF-8 encodin
LEVEL You use the LEVEL with the SELECT CONNECT BY statement to categorize rows from a database table into a tree structure. The LEVEL returns the level number of a node in a
Block Structure The PL/SQL is a block-structured language. That is, the fundamental units (procedures, anonymous blocks, and functions) that make up a PL/SQL program are logi
ORIGIN OF EARTH - BIG-BAN G HYPOTHESIS - Origin of life is linked to origin of earth. Cosmos, the Universe originated 10-20 billion years ago by Big Bang (thermonu
Literals A literal is an explicit numeric, string, character, or Boolean value not represented by an identifier. Numeric literal 147 and the Boolean literal FALSE are some of
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