SQL For Data Analysis > Understand Databases and Relationships

Foreign Key

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A foreign key (FK) is a column or set of columns used to create and enforce a link between data in two tables in order to limit the amount of data that may be stored in the foreign key table.

A primary key is used to ensure that each column's value is unique. The foreign key is what connects the two tables together.

A foreign key is a column (or a concatenation of columns) in a table that is identical to the primary key of another table in the database. In a relational database, the matching of foreign key values to main key values reflects data relationships.

You can use a key and cross-domain analysis job to locate foreign key candidates, pick foreign keys, and then check their referential integrity to build and validate table relationships. In the Key and Cross-Domain Analysis workspace, you find foreign keys.

The column or columns that hold values that uniquely identify each row in a table are referred to as the main key. To insert, edit, recover, or delete data from a database table, the table must have a primary key.

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Juboraj Juboraj
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Explain details & easy to understand.

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Aman Kanaujia
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All good , but provide the data also for the assignment , Without data the interest is less day by day from the course. So, try to solve this problem as asap.

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Snehil
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Everything is good but keyboard sounds more harsh and overlap your voice whereas this course is best.

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FAROOK MOHAMMAD
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Hello sir, explaination is excellent. I have a request please send the db in excel or SQL file.

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Hari Prakash
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In SQL Join Function's 2nd video - Teacher's voice dose not match with background content that are plays

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Aakash Mavar
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Ashok Kumar Sonkar
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Super Duper Traning

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Harshit Chauhan
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Swati Patil
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Excellent

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Avinash Rawat
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  1. Getting Started
    18m 54s

  1. SQL Datatypes
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  2. SQL Commands
    21m 59s
  3. What is DBMS
    27m 51s
  4. What is RDBMS
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  1. Database Relationships
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  2. Primary Key
    6m 50s
  3. Unique Key
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  4. Foreign Key
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  5. Difference between PK, UK and PK & FK
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  1. SQL Server Installation Step by Step
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  1. How to Create Database in SQL Server
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  2. Assignment : SQL Create Table
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  1. SQL Constraints
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  1. Filtering Data using Selection Command
    31m 53s
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  7. SQL Functions for Data Analytics - 1
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  10. Row Number Function
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  12. How to use SQL Conditional Statements
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  13. How to use SQL Group by Clause
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  14. SQL Practical with Examples
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  15. Assignment : SQL Date and Time
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  1. Type of Joins in SQL - INNER, LEFT
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  3. SQL Joins Practical Session 1
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  7. SQL Joins Practical Session 5
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  11. Assignment : SQL SubQueries
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  1. What are Views?
    22m 19s
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  1. What is SQL Index?
    13m 29s
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  1. Create Tables using Select Statement
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    23m 32s
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    22m 42s
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  8. Insertion from Multiple Tables
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  11. Assignment : SQL Insert, Update & Delete
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  1. Loading & Connecting Different Files in SQL
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  1. Course Summary
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  1. Interview Questions Part 1
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  1. Career Guideline
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