Which of the following sql statements is valid for mysql, oracle, and ms sql server?

Q: Which of the following SQL statement is correct?

1 Answer. The correct answer to the question Which of the SQL statements is correct” is option (b). SELECT Username, Password FROM Users. And all the other options are incorrect.

Inhaltsverzeichnis Show

What is SQL?
Types of SQL Statements
SELECT Statement
What are the 5 SQL statement types?
Which are 3 different types of SQL statements that you can execute?
Which of the following SQL statement is the correct way to create a database?
Which of the following SQL statement is correct?

What is SQL?

SQL stands for Structured Query Language, as it is the special purpose domain-specific language for querying data in Relational Database Management System (RDBMS).

Microsoft SQL Server, MySQL, Oracle, etc. use SQL for querying with slight syntax differences.

Types of SQL Statements

SQL statements are categorized into four different types of statements, which are

DML (DATA MANIPULATION LANGUAGE)
DDL (DATA DEFINITION LANGUAGE)
DCL (DATA CONTROL LANGUAGE)
TCL (TRANSACTION CONTROL LANGUAGE)

Let's see one by one.

DML

In Data Manipulation Language(DML), we have four different SQL statements, Select, Insert, Update, and Delete.

SELECT Statement

The SELECT statement is used to select records from the table, with or without a condition.

Example

select * from student- Gets all records of student table.
Select * from student where rank>5- Gets records with the condition where students' rank is greater than 5.

INSERT

INSERT statement is used to insert a set of values into a database table. Insert statement it used with Values. Example- Insert Into Student (Rank, StudentName, Mark) Values(1,’Kumar’,450)

UPDATE

The UPDATE statement is used to update existing values in a table, which is based on some condition.

Example

update student set StudentName=’Manoj’ where StudentName=’Kumar’

The query given above will update the studentName from Manoj to Kumar where student Name Kumar. Read more- Insert and Update in SQL Server

DELETE

Delete statement is used to delete the existing record in the table, which is based on some condition.

Example

Delete from Student where StudentName=’Manoj’

The query given above will delete records which has StudentName as Manoj.

DDL

In Data Definition Language (DDL), we have three different SQL statements.

CREATE

CREATE statement is used to create a new table in an existing database. CREATE statement is also used to create other database object such as a stored procedure, function, etc.

Example

Create Table Student (Rank Int,StudentName varchar(50),Mark Float)

ALTER

Alter statement can add a column, modify a column, drop a column, rename a column or rename a table.

Example

Alter Table Student Add (StudentAddress varchar (100))

DROP

SQL DROP TABLE statement is used to remove a table definition and all the data, indexes, triggers, constraints and permission specifications for the table.

Example

Drop Student

TRUNCATE

TRUNCATE SQL query removes all rows from a table, without logging the individual row deletions.

Example

Truncate Table Table_Name

Read more- Difference Between Truncate, Delete and Drop-in SQL Server

DCL

In Data Control Language(DCL), it defines the control over the data in the database. We have two different commands, which are

GRANT

Grant is allowed to do the specified user to the specified tasks. Syntax GRANT privilege_name

ON object_name

TO {user_name |PUBLIC |role_name}

[WITH GRANT OPTION];

REVOKE

It is used to cancel previously granted or denied permissions. Syntax REVOKE privilege_name

ON object_name

FROM {user_name |PUBLIC |role_name}

TCL

In Transaction Control Language (TCL), the commands are used to manage the transactions in the database. These are used to manage the changes made by DML statements. It also allows the statements to be grouped together into logical transactions.

COMMIT

Commit command is used to permanently save any transaction into the database.

Syntax

Commit;

Read more- Commit and Rollback Commands in SQL Server

ROLLBACK

Rollback command is used to restore the database for the last committed state. It’s also used with a save point to jump to the save point. Syntax Rollback to savepoint name Read more- Commit and Rollback in SQL Server

SAVEPOINT

SAVEPOINT command is used to temporarily save a transaction so that you can roll back to that point whenever necessary. Syntax savepointsavepoint-name; Read more- What is the usage of savepoints

These are the different types of statements in the SQL language. I hope, this will be helpful for the readers. Thanks for reading.

What are the 5 SQL statement types?

Types of SQL Statements.

Data Definition Language (DDL) Statements..

Data Manipulation Language (DML) Statements..

Transaction Control Statements..

Session Control Statements..

System Control Statement..

Embedded SQL Statements..

Which are 3 different types of SQL statements that you can execute?

Types of SQL Statements.

DML (DATA MANIPULATION LANGUAGE).

DDL (DATA DEFINITION LANGUAGE).

DCL (DATA CONTROL LANGUAGE).

TCL (TRANSACTION CONTROL LANGUAGE).

Which of the following SQL statement is the correct way to create a database?

Create Database The SQL statement CREATE is used to create the database and table structures.

Which of the following SQL statement is correct?

1 Answer. The correct answer to the question “Which of the SQL statements is correct” is option (b). SELECT Username, Password FROM Users. And all the other options are incorrect.