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PLSQL Interview Questions And Answers
You’ve probably heard of SQL and once you understand this programming language, you might be tempted to stick with it. However, do you know what PLSQL is? What advantages and benefits can you take if you learn PLSQL? Find out by reading this informative blog post! plsql interview questions
PL/SQL is a procedural language introduced during the late 1970s and early 1980s. It was originally known as PL/S and had some features that made it non-interoperable with other SQL implementations. These problems were fixed in Oracle9i ( plsql interview questions and SQL:2008.
This article will cover all the basics of PLSQL, its language structure, some of the most common interview questions you may encounter, and some more advanced tips. PLSQL is an SQL-like programming language developed by IBM.
The PL/SQL programming language was developed by Oracle Corporation in the late 1980s as a procedural extension language for SQL and the Oracle relational database.
PL/SQL is a block-structured language that enables developers to combine the power of SQL with procedural statements. All the statements of a block are passed to the oracle engine all at once which increases processing speed and decreases the traffic. plsql interview questions PL/SQL extends SQL by adding constructs found in procedural languages, resulting in a structural language that is more powerful than SQL. The basic unit in PL/SQL is a block. All PL/SQL programs are made up of blocks, which can be nested within each other.
It’s a relational programming language used in the Oracle 10g to 12c database. Plsql is quite popular because building applications in an Oracle Database is so easy with it plsql interview questions. There are several reasons why you may want to learn PLSQL.
Even if you’re not specifically looking to expand your programming knowledge, it gives you the opportunity to improve your overall skills and save money. Learning PLSQL will also save time because PLSQL is an efficient way of handling queries without having to write multiple queries for various routine computational tasks.
PL/SQL is basically a procedural language, which provides the functionality of decision making, iteration, and many more features of procedural programming languages.
PL/SQL can execute a number of queries in one block using a single command.
One can create a PL/SQL unit such as procedures, functions, packages, triggers, and types, which are stored in the database for reuse by applications.
PL/SQL provides a feature to handle the exception which occurs in PL/SQL block known as the exception handling block. Applications written in PL/SQL are portable to computer hardware or operating system where Oracle is operational. plsql interview questions
PL/SQL offers extensive error checking.
Tight Integration with SQL.
High Performance & High Productivity.
Portability & Scalability.
Manageability.
Support for Object-Oriented Programming.
Support for Developing Web Applications.
If you ensure about your PLSQL skills and how to approach a job interview, this blog is for you. It gives you tips on how to prepare for an interview and what questions to expect. One of the main things it talks about is “know your core competencies” which are all the skills that make you comfortable with programming in general.
When learning PLSQL, you’ll need to know some basic SQL commands. The most common ones are SELECT, INSERT, UPDATE, DELETE. You’ll also need to know about the data types in SQL. For example, integers are for numbers on a range of 0-9 with no decimal places.
PL/SQL program units organize the code into blocks. The anonymous block has three basic sections that are declaration, execution, and exception handling. Only the execution section is mandatory and the others are optional. The declaration section allows you to define data types, structures, and variables.
Triggers are stored programs, which are automatically executed or fired when some events occur. Triggers are, in fact, written to be executed in response to any of the following events like database manipulation (DML) statement (DELETE, INSERT, or UPDATE) A database definition (DDL) statement (CREATE, ALTER, or DROP).
Why is PLSQL needed?
PL/SQL gives high productivity to programmers as it can query, transform, and update data in a database. PL/SQL saves time on design and debugging by strong features, such as exception handling, encapsulation, data hiding, and object-oriented data types. Applications written in PL/SQL are fully portable.
Following are some different types of PL/SQL units:
A stored function (also called a user function or user-defined function) is a set of PL/SQL statements you can call by name. Stored functions are very similar to procedures, except that a function returns a value to the environment in which it is called. User functions can be used as part of a SQL expression.
PLSQL Execution Environment:
The PLSQL engine resides in the Oracle engine. The Oracle engine can process not only a single SQL statement but also a block of many statements. The call to the Oracle engine needs to be made only once to execute any number of SQL statements if these SQL statements are bundled inside a PLSQL block.
Numeric: Numeric values on which arithmetic operations are performed.
Character: Alphanumeric values that represent single characters or strings of characters.
Boolean: Logical values on which logical operations are performed.
Datetime: Declares Dates and times.
Control Structures in PLSQL?
PL/SQL has three categories of control statements: conditional selection statements, loop statements and sequential control statements.
PLSQL stored procedures are compiled once and stored in executable form, so procedure calls are efficient. Because stored procedures execute in the database server, a single call over the network can start a large job. This division of work reduces network traffic and improves response times.
How do you code in PLSQL?
PL/SQL is a programming language designed for managing data in Oracle databases. You code in PL/SQL by creating blocks of code that consist of declarations, executable statements, and exception handling.
What is the package in PLSQL?
A package in PL/SQL is a logical grouping of related procedures, functions, variables, and other constructs. It helps in organizing and modularizing code, making it easier to manage and maintain.
What are the components of the PLSQL package?
The components of a PL/SQL package include:
Package Specification: Contains declarations of types, variables, constants, exceptions, cursors, and subprograms (procedures and functions). Defines the public interface.
Package Body: Contains the implementation of the procedures and functions declared in the specification. Includes the actual code for the logic defined in the specification.
What are identifiers in PLSQL?
In PL/SQL, identifiers are used to name various program elements such as variables, constants, procedures, functions, and packages. Identifiers must adhere to certain rules:
Here you will find answers to questions on everything from the features you can expect, all of which makes up part of the PLSQL training from Asha24.
Master data management (MDM) is a comprehensive method of enabling an enterprise to link all of its critical data to one file, called a master file, that provides a common point of reference. When properly done, MDM streamlines data sharing among personnel and departments.
A data movement mode determines how the power center server handles the character data. We choose the data movement in the Informatica server configuration settings. Two types of data movement modes available in Informatica.
It’s a matter of awareness and the problem becoming urgent. We are seeing budgets increased and greater success in closing deals, particularly in the Pharmaceutical and Financial services industries. Forrester predicts MDM will be $6 billion markets by 2010, which is a 60 percent growth rate over the $1 billion MDM market last year. Gartner forecasted that 70 percent of Global 2000 companies will have an MDM solution by the year 2010. These are pretty big numbers
We can export repository and import into the new environment
We can use Informatica deployment groups
We can Copy folders/objects
We can Export each mapping to XML and import in a new environment
It is a repository object that helps in generating, modifying or passing data. In a mapping, transformations make a representation of the operations integrated with service performs on the data. All the data goes by transformation ports that are only linked with maple or mapping.
Foreign keys of dimension tables are the primary keys of entity tables.
Foreign keys of facts tables are the primary keys of dimension tables.
A Mapplet is a reusable object that contains a set of transformations and enables to reuse that transformation logic in multiple mappings.
There are two different ways to load data in dimension tables.
Conventional (Slow) – All the constraints and keys are validated against the data before, it is loaded; this way data integrity is maintained.
Direct (Fast) – All the constraints and keys are disabled before the data is loaded. Once data is loaded, it is validated against all the constraints and keys. If data is found invalid or dirty it is not included in the index and all future processes are skipped on this data.
Designed by Informatica Corporation, it is data integration software providing an environment that lets data loading into a centralized location like a data warehouse. From here, data can be easily extracted from an array of sources, also can be transformed as per the business logic and then can be easily loaded into files as well as relation targets.