What are the main topics in Plsql?
Table of Contents
PL/SQL is a block structured language that can have multiple blocks in it. Our PL/SQL tutorial includes all topics of PL/SQL language such as conditional statements, loops, arrays, string, exceptions, collections, records, triggers, functions, procedures, cursors etc.
What are the basic interview questions for SQL?
SQL Interview Questions
- What is the difference between SQL and MySQL?
- What are the different subsets of SQL?
- What do you mean by DBMS?
- What do you mean by table and field in SQL?
- What are joins in SQL?
- What is the difference between CHAR and VARCHAR2 datatype in SQL?
- What is the Primary key?
- What are Constraints?
What is PL SQL used for?
PL/SQL lets you use all SQL data manipulation, cursor control, and transaction control statements, and all SQL functions, operators, and pseudocolumns. PL/SQL fully supports SQL data types. You need not convert between PL/SQL and SQL data types.
Why is PL SQL important?
PL/SQL allows sending an entire block of statements to the database at one time. This reduces network traffic and provides high performance for the applications. PL/SQL gives high productivity to programmers as it can query, transform, and update data in a database.
What are called records in PL SQL?
PL/SQL has three types of records: table-based, cursor-based, programmer-defined. Before using a record, you must declare it.
What are data types in PL SQL?
PL/SQL has two kinds of data types: scalar and composite. The scalar types are types that store single values such as number, Boolean, character, and datetime whereas the composite types are types that store multiple values, for example, record and collection.
What are the 5 basic SQL commands?
There are five types of SQL commands: DDL, DML, DCL, TCL, and DQL.
- Data Definition Language (DDL) DDL changes the structure of the table like creating a table, deleting a table, altering a table, etc.
- Data Manipulation Language.
- Data Control Language.
- Transaction Control Language.
- Data Query Language.
What is SQL Fullform?
Structured Query LanguageSQL / Full name
What is trigger in Plsql?
A PL/SQL trigger is a named database object that encapsulates and defines a set of actions that are to be performed in response to an insert, update, or delete operation against a table. Triggers are created using the PL/SQL CREATE TRIGGER statement.
Is keyword in PL SQL?
Answer: The PL/SQL language evolved such the the “IS” and “AS” operators are equivalent. Functionally the “IS” and “AS” syntax performs identical functions and can be used interchangeably. However, in SQL there is a subtle difference between “AS” and “IS”: SQL> create or replace view emp_view as select * from scott.
What is cursor in Plsql?
A cursor is a pointer to this context area. PL/SQL controls the context area through a cursor. A cursor holds the rows (one or more) returned by a SQL statement. The set of rows the cursor holds is referred to as the active set.
What is type in Plsql?
The %TYPE attribute lets use the datatype of a field, record, nested table, database column, or variable in your own declarations, rather than hardcoding the type names. You can use the %TYPE attribute as a datatype specifier when declaring constants, variables, fields, and parameters.
What are the good SQL Developer interview questions?
This interview question targets the developer’s knowledge of the SQL server roles and the authority/permissions related to them. SQL Server roles are similar to Active Directory groups on Windows. They enable a server or database administrator to assign database-wide function(s) to an individual or group.
What to know for SQL in interview?
Meets academic and training requirements outlined in the job description
How to prepare the best answers to any interview questions?
Research: Learn as much as you can about the company and the position.
How to answer the most frequently asked interview questions?
buying. This is the single most important strategy in executive job hunting. So, before you answer this or any question, it’s imperative that you try to uncover your interviewer’s greatest need, want, problem or goal. To do so, make sure you take these two steps: (1) Do all the homework you can before the interview to uncover this person’s