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MySql
3 followers study24x7 08 Jul 2024 12:09 PM study24x7 study24x7

How do you handle large amounts of data that are required to be inserted or updated in the database?
Ans. Handling large amounts of data that need to be inserted or updated in a database can be challenging. But there are several strategies th...

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3 followers study24x7 05 Jul 2024 12:25 PM study24x7 study24x7

What are the different types of database replication?
Ans. a) Master-slave replication: In master-slave replication, there is one master database and one or more slave databases. The master database is the primary database, and all c...

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MySql
3 followers study24x7 05 Jul 2024 12:24 PM study24x7 study24x7

Can you explain the concept of database replication, and how is it useful?
Ans. Database replication is the process of creating and maintaining multiple copies of a database in different locations. The purpose of database replication is to im...

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3 followers study24x7 05 Jul 2024 12:23 PM study24x7 study24x7

How do you implement backup and recovery strategies in SQL?
Ans. We can implement backup and recovery strategies in SQL using the following tips: a) Determine the appropriate backup strategy: Determine the appropriate backu...

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MySql
3 followers study24x7 04 Jul 2024 10:08 AM study24x7 study24x7

How do you implement security in a SQL database?
Ans. Implementing security in a SQL database is an important aspect of database administration. Here are some steps to follow for implementing it: a) Secure access to the database serv...

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3 followers study24x7 04 Jul 2024 10:06 AM study24x7 study24x7

How do you handle deadlock situations in SQL?
Ans. In SQL databases, deadlocks can occur when two or more transactions are in a waiting state, each waiting for the other to release resources necessary to complete their respective tasks. This ...

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3 followers study24x7 04 Jul 2024 10:05 AM study24x7 study24x7

What is a stored procedure in SQL, and how do you create and execute one?
Ans. A stored procedure is a pre-written, compiled SQL program that is stored in a database and can be executed multiple times. Its role is to simplify complicated data...

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MySql
3 followers study24x7 03 Jul 2024 10:11 AM study24x7 study24x7

How do you implement data integrity in a SQL database?
Ans. Data integrity in a SQL database is implemented to ensure that data is accurate, consistent, and valid throughout the database. There are several ways to implement data integrity in ...

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3 followers study24x7 03 Jul 2024 10:09 AM study24x7 study24x7

Give an example of a recursive query in SQL.
Ans. Here’s an example of a recursive query in SQL: WITH RECURSIVE cte_hierarchy AS ( SELECT id, name, manager_id FROM employees WHERE id = 1 UNION ALL SELECT e.id, e.name, e.manager_i...

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3 followers study24x7 03 Jul 2024 10:08 AM study24x7 study24x7

What is a recursive query, and how is it useful in SQL?
Ans. A recursive query in SQL is a query that references itself in order to build a hierarchical result set. It is also known as a hierarchical or recursive CTE (Common Table Expression)...

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3 followers study24x7 02 Jul 2024 11:49 AM study24x7 study24x7

An example of a query in SQL using GROUP BY.
Ans. Here’s an example of a SQL query using GROUP BY: SELECT region, COUNT(*) as num_orders, SUM(total_price) as total_sales FROM orders GROUP BY region; Here, the query groups the rows in the â...

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MySql
3 followers study24x7 02 Jul 2024 11:47 AM study24x7 study24x7

What is the purpose of the GROUP BY clause in SQL?
Ans. The GROUP BY clause in SQL is used to group rows that have the same values in one or more columns into summary rows, like computing the sum, average, count, or other aggregate functions ...

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3 followers study24x7 02 Jul 2024 11:47 AM study24x7 study24x7

How do you optimize SQL queries for better performance?
Ans. Here are some tips to optimise SQL queries for better performance: a) Use indexes: Indexes can significantly improve query performance by allowing the database to ...

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3 followers study24x7 01 Jul 2024 11:23 AM study24x7 study24x7

Can you explain the different types of SQL joins?
Ans. There are several types of joins in SQL used to combine data from two or more tables based on a common column. a) Inner join: This type of join returns only the rows f...

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3 followers study24x7 01 Jul 2024 11:18 AM study24x7 study24x7

What is the use of a subquery?
Ans. Subqueries in SQL can be used in a variety of ways, such as: a) Filtering data: A subquery can be used to filter the results of a main query based on a condition. For example, you could u...

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3 followers study24x7 01 Jul 2024 11:16 AM study24x7 study24x7

What is a subquery in SQL?
Ans. It is a query that is nested inside another query. It can be used to retrieve data from one or more tables, and the results of the subquery are then used in the main query to perform further operations.

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MySql
3 followers study24x7 28 Jun 2024 10:20 AM study24x7 study24x7

What is a cursor in SQL?
Ans. A cursor is a database object that provides a mechanism for selecting and processing individual rows of data from a result set. Cursors are typically used to iterate through the results of a query or stored proce...

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3 followers study24x7 28 Jun 2024 10:19 AM study24x7 study24x7

What is the role of transactions in SQL?
Ans. Transactions are important for maintaining the consistency and integrity of the data in a database. They allow multiple operations to be performed as a single unit, so that either all of the opera...

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3 followers study24x7 28 Jun 2024 10:18 AM study24x7 study24x7

What is a trigger in SQL?
Ans. A trigger is a database object that is associated with a table or view and is executed automatically in response to certain database events, such as insert, update, or delete operations on the table or view.

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3 followers study24x7 27 Jun 2024 11:43 AM study24x7 study24x7

What is a transaction in SQL?
Ans. A transaction is a logical unit of work that comprises one or more database operations that must be executed as a single, indivisible unit. It is usually composed of multiple SQL statements, such as INSERT, ...

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