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Category: SQL

SQL otherwise known as a structured query language is used by programmers to query and return data on a screen.

What is Data Integrity?

Posted on February 27, 2023March 17, 2023 By admin

Data integrity refers to the accuracy and consistency of data stored in a database or other data storage system. It ensures that the data in the system is reliable, accurate, and consistent over time. How is data integrity maintained? Data integrity is maintained by enforcing data validation rules, referential integrity constraints, and other data integrity…

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SQL, Working with databases

Explain different types of data Normalization.

Posted on February 27, 2023February 27, 2023 By admin

Normalization is a process of organizing data in a database to reduce data redundancy and ensure data integrity. There are several types of normalization, each with its own set of rules for eliminating data redundancy and improving data integrity. The most commonly used normalization levels are: There are also higher levels of normalization, such as…

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SQL, Working with databases

What is the difference between DROP and TRUNCATE in SQL?

Posted on February 27, 2023March 17, 2023 By admin

DROP and TRUNCATE are two SQL commands that can be used to remove data from a table, but they work in different ways: How to drop a table from a database It is important to remember that if you have the same name spread over a few databases, you should reference the correct databases, to…

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SQL, Working with databases

What is Query Optimization in SQL?

Posted on February 23, 2023March 12, 2023 By admin

Query optimization in SQL refers to the process of improving the performance of SQL queries by selecting the most efficient execution plan for the query. When a SQL query is executed, the database management system (DBMS) must determine the best way to retrieve the requested data from the database. Query optimization involves analyzing the query…

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SQL, Working with databases

What is a Clustered Index in SQL?

Posted on February 23, 2023March 12, 2023 By admin

In SQL, a clustered index is a type of index that determines the physical order of the data in a table. It organizes the table data based on the values in one or more columns, and stores the data in the table accordingly. When a clustered index is created on a table, the rows of…

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SQL, Working with databases

What is a Unique key in SQL?

Posted on February 23, 2023February 23, 2023 By admin

In SQL, a unique key is a constraint that ensures that the values in a column or set of columns are unique across all rows in a table and that the values cannot be null. A unique key is similar to a primary key, but it differs in that it does not necessarily need to…

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SQL, Working with databases

What Are Constraints in SQL?

Posted on February 23, 2023March 12, 2023 By admin

In SQL, constraints are rules that are enforced on a table’s data to maintain the integrity and accuracy of the data. Constraints can be applied to one or more columns in a table, and they can be added or removed as needed. Here are some of the most common types of constraints in SQL: Constraints…

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SQL, Working with databases

What is the difference between CHAR and VARCHAR2 in SQL?

Posted on February 23, 2023March 12, 2023 By admin

In SQL, both CHAR and VARCHAR2 are character data types, but they have some differences in terms of their storage and usage. CHAR: VARCHAR2: Here’s an example to illustrate the difference: In the char_test table, the name and address columns are both defined as CHAR, with fixed lengths of 10 and 20 characters, respectively. If…

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SQL, Working with databases

What is the difference between SQL and MySQL?

Posted on February 23, 2023March 12, 2023 By admin

SQL(Structured Query Language) and MySQL are related but distinct concepts. SQL is a programming language that is used to manage relational databases, while MySQL is a specific relational database management system (RDBMS) that uses SQL as its query language. Here are some key differences between SQL and MySQL: In summary, SQL is a language used…

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SQL, Working with databases

What is a CTE in SQL?

Posted on February 23, 2023March 12, 2023 By admin

CTE stands for Common Table Expression, and it is a temporary named result set that you can reference within a SQL statement. A CTE is defined within a query and is available only for the duration of that query. It allows you to create a named temporary table that you can reference multiple times within…

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SQL

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