What is Array in C ?
Arrays are defined as collection of similar type of data items that is stored at consecutive blocks of memory locations. Arrays are deprived data types which can store primitive data…
Month: September 2022
11 posts
Can you use UNIQUE KEY as a replacement for Primary Key ?
Both Keys are different. For Identifying each and every record in a table we use primary key. To apply additional uniqueness for other columns on the table we use Unique…
What are all the different attributes of indexes ?
The indexing has various attributes: Access Types: Value based search , range acess can be refered using Access types. Access Time: Time that is needed to find a data element…
What are the different types of SQL commands ?
DDL (Data Definition Language) DML (Data Manipulation Language) DCL (Data Control Language) TCL (Transaction Control Language) DDL(Data Definition Language) DDL is a syntax that is used for creating SQL commands.…
Difference between SQL and PLSQL
SQL PL/SQL SQL is structural query language for database. It has no variables. Pl/SQL is a programming language using SQL for database. It has variables and data types SQL has…
Char vs Varchar in SQL
Char VarChar Char data type is used for storing single character values It is a SQL Code that helps in storing variable character Used to store characters string of fixed…
What is Default constraint in SQL ?
Constraints are a certain set of rules used for processing data and limiting the type of data that can go into the table. The default constraint is used to define…
What are the different types of relationships in SQL ?
Data base collects different types of data that uses tables, record, and columns. For easy storage of data, a well-defined relationship is created between tables and databases. Data in a…
Types of indexes in SQL
There are various types of indexes in SQL server: Clustered Index Non-Clustered Index Column Store Index Filtered Index Hash Index Unique Index Clustered Index Rows of data are sorted and stored…
What is the difference between BETWEEN and IN operators in SQL ?
BETWEEN IN This condition allows you to check if given values are in the specified range. In operator is used for matching values in the given list of values. …
What is a join in SQL ? What are the types of joins ?
Data is stored in multiple tables that are related to each other in relational data bases like SQL Server, MySQL etc with a common key value. When we need to…
