SQL Tutorial > 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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Y
Yadav Aakash
5

very useful thank you learnvern

A
Ashish
5

The course is very good. I have stuck at a point that how you create multiple rows with a single insert in sales.customer table. I get only one customer data. this table is related to bikestore data.

N
nayazbasha sk
5

very useful thank you learnvern

M
Mahima Patel
5

very usefull......thanks

P
Priya Kushwaha
5

Very Good trainer

C
chanchal singh
5

you guys are doing nice job. thanks

U
Umesh Wankhede
5

Not too much interactive

M
Monesh Ram
5

Well Explained in Every Chapters..

G
GAJANAN DIGAMBAR MODE
5

very easy to understand SQL its was dream to learn SQL. Thanx for Learnvern

M
Mohmad Shadab
5

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    13m 29s
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    41m 2s
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  5. Using Union with Select Statement
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  6. Adding Multiple Records with Insert Statement
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  7. SQL Insert - Considerations and Best Practices
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  8. Insertion from Multiple Tables
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  10. SQL Delete - Types of Delete Operation Part -2
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  11. Assignment : SQL Insert, Update & Delete
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  1. Loading & Connecting Different Files in SQL
    11m 18s

  1. Course Summary
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  1. Interview Questions Part 1
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