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TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

12th Standard English Medium Computer Science Subject Structured Query Language (SQL) Book Back 2 Mark Questions with Solution updated Book back Questions

Published on: 13/05/2022

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Std: 12th Standard - Computer Science

chapter: - Book back Questions

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Questions:

Generic 2

5 x 2 = 10

What is the difference between SQL and MYSQL?

Which component of SQL lets insert values in tables and which lets to create a table?

Write the difference between table constraint and column constraint?

Differentiate Unique and Primary Key constraint

Write a query that selects all students whose age is less than 18 in order wise.

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Answers Key:

Generic 2

5 x 2 = 10

SQL	MYSQL
Structured Query Language is a language used for accessing database	MySQL is a database \| accessing databases. management system, like SQL Server, Oracle, Informix,postgres,etc.
SQL is a DBMS	MySQL is a RDBMS

Command Description Component Insert Inserts data into a table DML Create To create tables in the database DML

Table Constraints	column constraints
Table constraint is apply to a group of one or more columns.	Column constraint can be apply only to individual columns.

S.No	Unique Key Constraint	Primary Key Constraint
(i)	This constraint ensures that no two rows have the same value in the specified columns.	This constraint declares a field as a Primary Key which helps to uniquely identify a record.
(ii)	The UNIQUE constraint can be Create applied only to fields that have also been declared as NOT NULL.	The Primary Key does not allow NULL values.