SQL*Plus is a command-line tool that provides access to the Oracle RDBMS. SQL*Plus enables you to: Enter SQL*Plus commands to configure the SQL*Plus environment. Startup and shutdown an Oracle database.
Which is an iSQL * Plus command?
iSQL*Plus enables you to use a web browser to connect to Oracle9i and perform the same tasks as you would through the command-line version of SQL*Plus. Different web browsers, and the size of the web browser window, may affect the appearance and layout of iSQL*Plus screens.
Which one is part of SQL*Plus?
iSQL*Plus is a browser-based interface which uses the SQL*Plus processing engine in a three-tier model comprising: Client (Web browser). Middle tier (Application Server). Database (Oracle Database).
What are SQL*Plus variables?
If a double ampersand reference causes SQL*Plus to prompt you for a value, then SQL*Plus defines the variable as that value (i.e. the value is stored until you exit). Any subsequent reference to the variable (even in the same command) using either “&” or “&&” substitutes the newly defined value.
What is SQL*Plus interface?
SQL*Plus is the command-line interface to the Oracle database. Its fundamental reason for existence is to allow you to enter and execute ad hoc SQL statements and PL/SQL code blocks.
What is an * in SQL?
The second part of a SQL query is the name of the column you want to retrieve for each record you are getting. You can obviously retrieve multiple columns for each record, and (only if you want to retrieve all the columns) you can replace the list of them with * , which means “all columns”.
What is SQL * Forms Mcq?
The correct choice is (a) SQL * FORMS is a 4GL tool for developing and executing Oracle based interactive based application. For explanation I would say: SQL*Forms is a general-purpose tool for developing and executing forms-based interactive applications.
What are the 3 types of SQL commands?
There are 3 main types of commands. DDL (Data Definition Language) commands, DML (Data Manipulation Language) commands, and DCL (Data Control Language) commands.
What does the asterisk (*) symbol mean in SQL?
The asterisk or star symbol ( * ) means all columns. The semi-colon ( ; ) terminates the statement like a period in sentence or question mark in a question.
Does SQL have ++ operator?
Comparison Operators SQL++ (and JSON) has two ways of representing missing information in a object – the presence of the field with a NULL for its value (as in SQL), and the absence of the field (which JSON permits).
Why is sqlplus used?
SQL*Plus has its own commands and environment, and it provides access to the Oracle Database. It enables you to enter and execute SQL, PL/SQL, SQL*Plus and operating system commands to perform the following: Format, perform calculations on, store, and print from query results.
What are the functions of the SQL*Plus environment?
You can use SQL*Plus to generate reports interactively, to generate reports as batch processes, and to output the results to text file, to screen, or to HTML file for browsing on the Internet.
What does * do in command-line?
Wildcards (*) The wildcard * selects all of the files in the current directory. The above example will copy all of the files in the current directory to the directory called satire.
What are the functions of the SQL*Plus environment?
You can use SQL*Plus to generate reports interactively, to generate reports as batch processes, and to output the results to text file, to screen, or to HTML file for browsing on the Internet.
Which of the following is buffered by SQL*Plus?
SQL*Plus keeps a copy of the most recently entered SQL statement or PL/SQL block in an internal memory area known as the SQL buffer, often referred to as the buffer. Command-line SQL*Plus needs a place to store your statement or block until you are finished entering it.
Should you use * in SQL?
That’s all about why you should not use SELECT * in the SQL query anymore. It’s always better to use the explicit column list in the SELECT query than a * wildcard. It not only improves the performance but also makes your code more explicit.
What does this means a * MCQ?
A multiple-choice question (MCQ) is composed of two parts: a stem that identifies the question or problem, and a set of alternatives or possible answers that contain a key that is the best answer to the question, and a number of distractors that are plausible but incorrect answers to the question.
Is the full form of SQL *?
The full form of SQL is Structured Query Language. SQL is a program created and formulated in the Relational Database Management System to handle structured data. It was initially named a SEQUEL (Structured English Query Language developed addition).
Which is the type of SQL statements *?
Data Definition Language (DDL) Statements. Data Manipulation Language (DML) Statements. Transaction Control Statements. Session Control Statements.
What are the 5 types of SQL operators?
There are six types of SQL operators that we are going to cover: Arithmetic, Bitwise, Comparison, Compound, Logical and String.
How many SQL commands are there?
Five types of SQL queries are 1) Data Definition Language (DDL) 2) Data Manipulation Language (DML) 3) Data Control Language(DCL) 4) Transaction Control Language(TCL) and, 5) Data Query Language (DQL)
What are the 4 parts of SQL?
The scope of SQL includes data query, data manipulation (insert, update, and delete), data definition (schema creation and modification), and data access control.
