What are SQL interview questions?

How do I prepare for SQL interview?

If you want to perform well at the SQL job interview, these are the concepts you need to know:

  1. Data Definition Language (DDL) keywords.
  2. Data Manipulation Language (DML) keywords.
  3. Data Control Language (DCL) keywords.
  4. Transaction Control Language (TCL) keywords.
  5. SQL constraints.
  6. JOINs.
  7. indexes.
  8. transactions.

What are the interview questions asked in SQL?

Frequently Asked SQL Interview Questions and Answers for Freshers and Experienced

  • What is DBMS? …
  • What is RDBMS? …
  • What is SQL? …
  • What is a Database? …
  • What are tables and Fields? …
  • What is a primary key? …
  • What is a unique key? …
  • What is a foreign key?

What is SQL interview questions for freshers?

SQL Interview Questions and Answers for Freshers

  • What is SQL? …
  • What is the difference between SQL, SQL Server, and MySQL? …
  • What are the different subsets of SQL? …
  • What do you mean by DBMS? …
  • What is the difference between DELETE and TRUNCATE statements? …
  • What do you mean by the table, field, and record in SQL?

What are basic SQL skills?

10 SQL skills to develop for a career in programming

  • Microsoft SQL server skills. …
  • Execution skills. …
  • Database management. …
  • PHP skills. …
  • SQL Joins skills. …
  • Indexing skills. …
  • Related SQL system skills. …
  • OLAP skills.
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What are triggers in SQL?

A SQL trigger is a database object which fires when an event occurs in a database. We can execute a SQL query that will “do something” in a database when a change occurs on a database table such as a record is inserted or updated or deleted. For example, a trigger can be set on a record insert in a database table.

What are the topics in SQL?

The 10 areas we will cover in this article:

  • Key elements of a database.
  • Relational Keys.
  • Select Queries.
  • Joins.
  • Data Modelling.
  • Fact and Dimension Table Types.
  • Star Schema.
  • Snow Flake Schema.

What is primary key SQL?

In SQL, a primary key is a single field or combination of fields that uniquely defines a record. None of the fields that are part of the primary key can contain a NULL value. A table can have only one primary key. You use either the CREATE TABLE statement or the ALTER TABLE statement to create a primary key in SQL.

What is query in SQL?

What Does Query Mean? A query is a request for data or information from a database table or combination of tables. This data may be generated as results returned by Structured Query Language (SQL) or as pictorials, graphs or complex results, e.g., trend analyses from data-mining tools.

What is difference between SQL and MySQL?

In a nutshell, SQL is a language for querying databases and MySQL is an open source database product. SQL is used for accessing, updating and maintaining data in a database and MySQL is an RDBMS that allows users to keep the data that exists in a database organized. SQL does not change (much), as it is a language.

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