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Sql Queries Examples For Interview – This section of the SQL tutorial includes a SQL cheat sheet. Here you will learn various aspects of SQL that may be asked in interviews.
For a software developer or programmer, a basic knowledge of SQL is essential. It helps in retrieving information from the database and modifying the data and performing various operations.
Sql Queries Examples For Interview
This SQL cheat sheet provides the essential concepts you need to get started with SQL. It is useful for beginners who want to learn and work with SQL.
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This is a special operator used with WHERE to search for a specific pattern from a column or row.
It is used to specify that rows with total values that satisfy a specified condition should be returned
It is used to return all rows where key records from one table are the same as another table.
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It is used to return all rows in the left table with corresponding rows in the right table
It is used to return all the rows in the right table along with the corresponding rows in the left table
A set operation called ‘UNION’ can be used on the returned results which can join the results of one query to another.
Aggregate Function: It is a function where the values of multiple rows are combined to form a single value.
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Select Column 1 from Table T1 and Column 2 from Table T2 and merge the rows from these two queries.
This is a virtual table that is the result of a query. It is often used as a security mechanism that allows users to access data through views.
It is used to speed up query performance by reducing the number of database pages that must be visited.
It is a set of SQL statements with assigned names that can be shared and reused by multiple programs.
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It is a special type of stored procedure that is automatically executed when a user attempts to modify via a DML event.
This brings us to the end of the SQL cheat sheet. For in-depth knowledge, check out our interactive live SQL certification training here that comes with 24*7 support to guide you through your learning journey. s SQL online training equips you to manage database solutions, manage various operations on databases, migrate them to the cloud and scale on demand.
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SQL is the most popular data management query language. Moreover, it supports relational data, which helps in managing large amounts of data with desired relationships.
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Below SQL interview questions require specific data to define SQL queries. You can refer to the following data tables for examples.
Write a SQL query to retrieve the names of students with more than or equal to 50000 and less than or equal to 100000.
Answer Here we can use BETWEEN in the ‘WHERE’ clause to return the StudId of the student with the scholarship that meets the required criteria and then lookup the student’s name from the StudentDetails table. Can be used as a sub-question.
Write a query to retrieve student name and scholarship record. Return student details even if a scholarship record does not exist for the student.
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Write an SQL query to retrieve all records of students from the StudentDetails table who have a scholarship record in the StudentStipend table.
Answer To find duplicate records from the table we can use GROUP BY clause on all fields and then we have to use HAVING clause to return only those fields whose count is more than one i.e. rows with duplicate records.
Answer Here we can use Self Join because the requirement requires us to parse the student details table as two different tables for student and enrollment records.
Write a SQL query to retrieve records that exist in one table but not in another table using MINUS.
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Answer As explained below, we can add a MINUS clause to exclude some rows from the resulting rows.
Answer In the query below, we first get the score by project and then sort the result by score. For enumeration by project, we use the GROUP BY clause, and then we use the ORDER BY clause for the sort operation, on the project enumeration alias.
Write a SQL query to get all the details of students from the students details table who joined in the year 2018.
Answer SQL queries to find the nth highest allocation from a table for multiple databases are described below.
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Write a query to retrieve only the first name (string before spaces) from the name column of the student details table.
Answer Here we first need to retrieve the location of the space character in the name field, and then we use the LOCATE method in MySQL, CHARINDEX in SQL SERVER, and the string before the space fetch to get the first name from the name field. can extract, we will use SUBSTRING or MID method.
We can also use LEFT which returns the left part of a string up to a specified number of characters.
Answer We need to use the relative subquery to find the 3rd highest grant, the inner query will return us the count until we find that there are two rows that are greater than the other separate grants. Grants.
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This is about SQL Question Interview Questions with Complete Answers. I am sure this will help you to crack the Database Administrator (DBA) interview as an experienced or fresher and it will also boost your confidence. In this blog post we are going to look at some of the most common sql interview questions and give you tips on how to answer them.
So, whether you’re just starting out in your career or you’re preparing for an interview with a new company, read on for some helpful advice!
A database is a collection of information in an organized form for faster and better access, storage and manipulation. It can also be defined as a collection of tables, schema, views and other database objects.
A data warehouse refers to a central repository of data from various information sources. This data is collected, transformed and made available for mining as well as online processing.
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A table is a database object used to store records in the form of columns and rows in a field that contains data.
A field in a database table is a space allocated to store a particular record within the table.5. What is recorded in the database?
A record (also called a row of data) is an ordered set of related data in a table.6. What is a column in a table?
A column is a vertical entity in a table that contains all the information associated with a particular field in the table.
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A database management system is a collection of programs that enable a user to store, retrieve, update, and delete information from a database. What are the types of DBMS?
RDBMS stands for Relational Database Management System. RDBMS is a database management system (DBMS) based on the relational model. Data from relational databases can be accessed using Structured Query Language (SQL).
SQL Overview: SQL stands for Structured Query Language. It is an American National Standards Institute (ANSI) standard. It is a standard language for accessing and manipulating databases. Using SQL, some of the actions we can perform are creating databases, tables, stored procedures (SPs), executing queries, searching databases against databases, inserting, up to date, to export. What are the different types of SQL statements?
An index is used to speed up the performance of queries. This makes retrieving data from the table faster. An index can be created on a single column or group of columns.
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1. Unique Indexes: Unique indexes help maintain data integrity by ensuring that no two rows of data in a table have the same key values. A unique index can be automatically implemented when defining a primary key. This ensures that values in index key columns are unique.
2. Clustered Index: A clustered index rearranges the physical order of the table and searches based on key values. There will be only one clustered index per table.
3. Non-clustered index: Non-clustered index does not change the physical order of the table and maintains the logical order of the data. Each table can have many non-clustered indexes.19. What is the difference between clustered and non-clustered indexes?
It changes the way records are stored in the database because it arranges the rows according to the columns of the clustered index.
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It does not change the configuration method but creates it.
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