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prefer PL/SQL than SQL. Here are a few PL/SQL questions that can help to crack an interview. Download PL/SQL Interview Questions PDF. + Pl/sql Interview Questions and Answers, Question1: What is PL/SQL? Question2: Is there a PL/SQL Engine in SQL*Plus? Question3: Is there a limit on the. Pl Sql Interview Questions Answers - [Free] Pl Sql Interview Questions Answers [ PDF] [EPUB]. Frequently asked SQL Interview Questions with.
For named blocks, p-code is stored in the database, and it is used the next time the program is executed. How does a syntax error differ from a runtime error?
A misspelled keyword is an example of a syntax error. Try to find it. All work done by the transaction becomes permanent.
Other users can see changes in data made by the transaction. Any locks acquired by the transaction are released. Explain Implicit and Explicit cursors Oracle automatically declares an implicit cursor every time a SQL statement is executed.
The user is unaware of this and cannot control or process the information in an implicit cursor. The program defines an explicit cursor for any query that returns more than one row of data.
This declaration allows the application to sequentially process each row of data as the cursor returns it. How an Implicit cursor works?
An INSERT statement needs a place to receive the data that is to be inserted into the database; the implicit cursor fulfills this need. The most recently opened cursor is called the SQL cursor.
How an Explicit cursor works?
Explicit cursors — Explicit cursors are used for queries that return more than one row. It is a programmer-defined cursor for gaining more control over context area. In order to use explicit cursors, the following steps are used-. Implicit cursors- These cursors are created when any SQL statements are executed.
It is an attribute which is used for anchoring. The fields of the row have same name and data types as column in the view. This declares a record that can store an entire row for DEPT table.
By having the basic knowledge, you can face the interviewer with a greater confidence. Mar 27, , Posted in Interview Questions, 20 Questions.
There is a considerable difference between function, procedure and package. Differentiate between syntax and runtime errors? You need to add an exception handling section to handle those errors. The few possible combinations are: Explain the difference between Triggers and Constraints?
There are several differences between Triggers and constraints. Given below are the major ones: Trigger Constraints Trigger affects only those rows, which are added after it is enabled.
Constraints affects all the rows i. Triggers unlike constraints is capable of implementing high-end business rules that are complicated A constraint is responsible only for maintaining the integrity of the database.
It offers extensive error checking. Users can write their own customized error handling routines. It also allows free access and sharing of same subprograms by multiple applications. Explain cursor types? In order to use explicit cursors, the following steps are used- Declare the cursor, Syntax: Open the cursor Syntax: Fetch rows from the cursor Syntax: What is a mutating table and a constraining table?
A mutating table is the one, which is modified using a DML statement or a table with defined triggers. A constraining table is the one, which is being read for a referential integrity constraint. A cursor is a pointer to the area of the memory containing SQL statements and information for processing the statements.
What is the difference between execution of triggers and stored procedures? Stored procedure takes place explicitly when call statements are issued from another block. The trigger is implicitly executed whenever any activating events like the occurrence of DML statements happen.
Why triggers are used?