SQL For Data Analysis > Advanced SQL

Insertion from Multiple Tables

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Overview

SQL stands for Structured Query Language. It's a language that enables users to enter commands in order to manipulate data inside of a database table. SQL also enables users to perform queries on the data they have stored in the database table.

The most important thing about SQL is that it's able to help with various tasks such as: retrieving information from the database, adding new records, updating existing records and deleting old records from the database.

Inserting data from multiple tables into one in SQL is a common task. This video tutorial will walk you through the process of doing this step-by-step. It will also provide you with some tips on what to avoid when doing so.

3 Things You Need to Know About Inserting Data from Multiple Tables Into One in SQL

Inserting data from multiple tables into one table in SQL is the best way to organise and analyse data. Here are three things you need to know about inserting data from multiple tables into one table.

1) What is the difference between INSERT, MERGE, and UNION?

2) When should I use INSERT or MERGE?

3) How can I avoid errors when inserting data from multiple tables into one table?

How to insert data from multiple tables into one in SQL by using the INSERT INTO statement.

-The first step is to select the table names that you want to insert into and their corresponding column names. 

-The second step is to create an alias for each of these columns so that they are easier to type out later on. 

-The third step is to create a SELECT statement that will return all of the values from these columns together with their aliases, which will be used as placeholders in the INSERT statement. 

-The fourth step is to use this SELECT statement as input for your INSERT INTO statement, inserting the data from your SELECT statement into the table.


Best Practices for Using Multiple Tables in SQL

When designing a database, it is important to have a plan on how you are going to use it. Some of the common scenarios that require the use of multiple tables include:

- When you need to store data about different customers or products with separate entities and values.

- When you need to store information about different aspects of an object like its attributes and behaviour.


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SQL is a database management language that helps you to insert data from one table into another table. If you want to insert a row with values from another table into your existing table, SQL will help you do it. This is called an INSERT statement. 

The syntax for the INSERT statement is: INSERT INTO (column1, column2) VALUES(', '');

For example, to insert a row with two columns into your table, you would type: INSERT INTO Name (FirstName, LastName) VALUES('John','Elliott')

This statement would cause an error if the table already had rows and inserts cannot be done on tables that don't have rows.


To insert data into two tables in one query, you need to use the INSERT INTO clause. 

For example, insert the following code into a SQL query: 

INSERT INTO table1 VALUES ('test', 'value1'); 

INSERT INTO table2 VALUES ('test', 'value2'); 

SELECT * FROM table1; SELECT * FROM table2.


Inserting data from multiple tables into one table in SQL can be done using three different approaches. The first approach is to use the JOIN statement. The second approach is using the MERGE statement, and the third approach is using a UNION statement.

The best way to insert data from multiple tables into one table in SQL depends on the scenario and how you want your output to look like.

When you are trying to load data from one table to another in SQL, you need to know the syntax for the two types of tables:

The first type is called a join table. A join table is a table that contains both columns from one or more other tables and also has a column that links those other tables together. In this case, we want to load the data from our employee table into our company_employee_info table. 

The second type is called an inner join. An inner join is a special type of join where all rows in the joined tables must have matching values for both columns in order for them to be included in the result set. In this case, we want to load the data from our company_employee_info into our employee's information.


To get data from many tables, use the INSERT INTO SELECT command with the Join clause. A JOIN clause can be used to retrieve data from many tables. The ON clause is used to link these tables based on the conditions supplied. Let's say we want to combine data from several tables and insert it into a single table.

To combine tables, use the following syntax. Using the phrases UNION or UNION ALL is the simplest technique to join two tables together. These two approaches stack one set of data on top of the other. The distinction between the two keywords is that UNION accepts only separate values, whereas UNION ALL keeps all of the specified values.

Inserting Multiple Values into Multiple Tables in a Single Statement is entirely doable.

The Oracle INSERT ALL statement adds several rows to a table using a single INSERT statement. With just one SQL command, the rows can be inserted into one or multiple tables.

You should be able to perform this using an INSERT INTO MyTable SELECT statement if you have create access. The INSERT INTO command does not create a new table.

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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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Harshit Chauhan
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Swati Patil
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Excellent

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Avinash Rawat
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Pravin Kashid
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excellent teaching technique...one of the best course content...

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  1. Getting Started
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  1. SQL Datatypes
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  2. SQL Commands
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  3. What is DBMS
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  1. How to Create Database in SQL Server
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  1. SQL Constraints
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  2. SQL Insert Statement and SQL Alias
    28m 12s

  1. Filtering Data using Selection Command
    31m 53s
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  7. SQL Functions for Data Analytics - 1
    38m 28s
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  10. Row Number Function
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  11. DenseRank and Cumulative Distribution
    29m 12s
  12. How to use SQL Conditional Statements
    4m 22s
  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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  4. SQL Joins Practical Session 2
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  5. SQL Joins Practical Session 3
    27m 43s
  6. SQL Joins Practical Session 4
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  7. SQL Joins Practical Session 5
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    15m 5s
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    13m 25s
  10. Assignment : SQL Functions 2
    9m 25s

  1. Practice: SQL Subqueries
    26m 41s
  2. Practice: SQL Subqueries & Unions
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    30m 51s
  5. SQL Correlated Subqueries Part 3
    30m 45s
  6. SQL Correlated Subqueries Part 4
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  8. Correlated Select, Update & Delete Queries
    33m 15s
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  10. SQL EXCEPT & INTERSECT
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  11. Assignment : SQL SubQueries
    30m 7s

  1. SQL Pivot, UnPivot Practical Example - 1
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  1. What are Views?
    22m 19s
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    16m 41s
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    17m 47s
  4. Assignment : SQL Views
    10m 17s

  1. What is SQL Index?
    13m 29s
  2. SQL Index types
    24m 50s

  1. Create Tables using Select Statement
    41m 2s
  2. Using Correlated Sub Query, Group By with Select Statement
    40m 2s
  3. Using Group By and Having Clauses with Select Statement
    23m 32s
  4. Using Index Optimizer with Select Statement
    23m 24s
  5. Using Union with Select Statement
    35m 4s
  6. Adding Multiple Records with Insert Statement
    22m 42s
  7. SQL Insert - Considerations and Best Practices
    9m 19s
  8. Insertion from Multiple Tables
    22m 11s
  9. SQL Delete - Types of Delete Operation Part -1
    16m 41s
  10. SQL Delete - Types of Delete Operation Part -2
    11m 38s
  11. Assignment : SQL Insert, Update & Delete
    7m 24s

  1. Loading & Connecting Different Files in SQL
    11m 18s

  1. Course Summary
    9m 6s

  1. Interview Questions Part 1
    22m 2s
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    20m 56s

  1. Career Guideline
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