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...
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....
What are the different types of SQL commands ?
DDL (Data Definition Language) DML (Data Manipulation Language) DCL (Data Control Language) TCL (Transaction Control...
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...
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...
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....
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...
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...
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...
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...
What are the different types of database management systems ?
Database Management System is classified into four types: Hierarchical Database It is a tree like structure where the data...
What is a Database ?
In computing, database is an organized collection of data stored which is accessed electronically. A database is usually...
What is a primary key ?
In relational database primary key is a specific choice of minimal set of attributes that uniquely specify a relation....
What is Normalization in SQL ?
It is a rule where larger tables are divided into smaller tables and they are linked using relationships. Process of...
What is SQL ?
SQL stands for Structured Query Language. It is used for interacting with databases. SQL is also known as standard query...
Lazy writer in Memory ?
Answer : Lazy write is an effect caused by the use of a write-back cache...
What is the difference between the SubQuery and Corelated SubQuery ?
Answer : The inner query is executed only once...
What is the Difference between join and union ?
Answer : The union operator combines the results of two or more queries into a single result set...
What is the SQLCode -501 ?
Answer : sqlcode -501 pops up to show...
What is the difference between a HAVING CLAUSE and a WHERE CLAUSE ?
Answer : The HAVING clause sets conditions on the GROUP BY...
