How To Create Views In MariaDB Group By

In this MariaDB lesson, you’ll learn how to use the MariaDB GROUP BY clause to construct views in the table. To assist you in better understanding the topic, we’ll investigate and wrap up a few examples in this part. The topics we will cover are listed below.

• How can we use the MariaDB GROUP BY clause to generate a view on the table?
• How can we use the COUNT function with MariaDB’s GROUP BY clause to generate a view on the table?
• How can we use the MariaDB WHERE condition and GROUP BY clause to generate a view on the table?
• Using the MariaDB GROUP BY HAVING clause, how do you generate a view on the table?
• How can we utilize the MariaDB GROUP BY and ORDER BY clauses to generate a view on the table?

How to Create Views in MariaDB Group By

Here, we will learn and understand how to create a view on the table by using the MariaDB GROUP BY clause in the query, which is explained with the help of syntax and a sample example.

The group by clause in MariaDB divides a result’s rows into categories. The aggregate functions count(), min(), max(), sum(), and avg() are frequently used with the group by function to obtain attributes of groups.

For example, the number of elements (count), the total of values (sum), the maximum element (max), the minimum element (min), and the average of elements (avg). Here is the syntax for creating a view on the table with the help of the MariaDB GROUP BY clause isven below:

SYNTAX:

CREATE [ OR REPLACE] [ IF NOT EXISTS] VIEW_NAME
[COLUMN_LIST] 
AS 
SELECT EXPRESSION, AGGREGATE_FUNCTION(EXPRESSION) FROM YOUR_TABLENAME
WHERE [ CONDITIONS ] 
GROUP BY COLUMN_NAME,COLUMN_NAME_2, ..... , COLUMN_NAME_N;

Explanation of parameters or arguments of the syntax:

• EXPRESSION: The expressions that must be contained in the GROUP BY clause but are not encased within an aggregate function.
• AGGREGATE_FUNCTION( EXPRESSION): It can function as COUNT, MAX, MIN, SU,M or AVG functions.
• YOUR_TABLENAME: The tables from which you want to get records. The FROM clause should indeed list one table at a minimum.
• WHERE [ CONDITIONS ]: It is optional and these conditions should be used to meet for the records to be selected.

Here is a sample example of creating a view by using the MariaDB GROUP BY clause on the table which is shown in the below query:

EXAMPLE:

CREATE VIEW USA_MITUNIVERSITY
AS 
SELECT * FROM MIT_STUDENTS
WHERE ID> 8
GROUP BY PHYSICS;

SELECT * FROM USA_MITUNIVERSITY;

As we see in the above query, we have used the CREATE VIEW statement to create a view called USA_MITUNIVERSITY on the MIT_STUDENTS table. Then the AS keyword followed by the SELECT statement will retrieve all records from the MIT_STUDENTS table with the WHERE condition.

In the WHERE condition, the ID column is used with the GREATER THAN operator to find a value greater than 8 and then grouped the records of the PHYSICS column by using the GROUP BY clause on the MIT_STUDENTS table.

If the WHERE condition gets a TRUE value then the SELECT statement will retrieve all records from the MIT_STUDENTS table. But if the SELECT statement gets executed successfully and retrieves empty records set from the MIT_STUDENTS table only when the WHERE condition gets a FALSE value.

To check the view_name has been created in the current database, we have used the SELECT statement to retrieve all records from the USA_MITUNIVERSITY view.

We hope that you have understood the subtopic “Learning to create views in MariaDB Group By” by using the MariaDB CREATE VIEW and GROUP BY clause on the table by the query. For a better understanding, we have used a sample example and defined it in depth.

Read: MariaDB See If Table Exists

How to Create Views in MariaDB Group By Count

In this subtopic tutorial, we will learn and understand how to create a view by using the MariaDB COUNT function and GROUP BY clause on the table in the query. And which is explained with the help of a sample example.

The MariaDB COUNT function is used to return the total count of records in the expression or column_name in the query.

EXAMPLE:

CREATE VIEW USA_MIT_UNIVERSITY
AS 
SELECT *,COUNT(PHYSICS) FROM MIT_STUDENTS
WHERE ID> 8
GROUP BY PHYSICS;

SELECT * FROM USA_MIT_UNIVERSITY;

In the preceding query, we have created a view called USA_MIT_UNIVERSITY on the MIT_STUDENTS table by using the CREATE VIEW statement. Then with the AS keyword followed by the SELECT statement. In the SELECT statement, it will retrieve all records from the MIT_UNIVERSITIES table. In the COUNT function, it will count all records of the PHYSICS column in the MIT_STUDENTS table with the WHERE condition.

In the WHERE condition, the ID column is used with the GREATER THAN operator to find a value greater than 8 from the MIT_STUDENTS table and then groups the records of the PHYSICS column by using the GROUP BY clause.

If the WHERE condition turns out to be TRUE then the SELECT statement will retrieve all records from the MIT_STUDENTS table otherwise vice-versa. To check whether the view has been created in the current database or not, we will use the SELECT statement to retrieve all records from the USA_MIT_UNIVERSITY view.

We hope that you have understood the subtopic “Learning to create views in MariaDB Group By Count” by using the MariaDB CREATE VIEW statement on the table by the query. We have used a sample example and described it in deepness, for a better understanding.

Read: MariaDB Order By Decreasing

How to Create Views in MariaDB Group By Condition

We will learn and understand how to create a view by using the MariaDB WHERE condition and GROUP BY clause on the table by the following query:

EXAMPLE:

CREATE VIEW STATES_OF_CANADA
AS 
SELECT * FROM CANADA_STATES
WHERE STATE_ID<=15
GROUP BY FIRST_NAME;

SELECT * FROM STATES_OF_CANADA 
ORDER BY STATE_ID ASC;

In the forenamed query, the CREATE VIEW statement is used to create a view called STATES_OF_CANADA on the CANADA_STATES table. Then we used the SELECT statement which is previously followed by the AS keyword. In the SELECT statement, it will retrieve all records from the CANADA_STATES table which is used with the WHERE condition.

In the WHERE condition, the STATE_ID column is used with the LESS THAN or EQUAL TO operators to find a value less than or equal to 15 from the CANADA_STATES table. Then we used the GROUP BY clause to group the records of the FIRST_NAME column in the CANADA_STATES table.

If the WHERE condition turns out to be TRUE then the SELECT statement will retrieve all records from the CANADA_STATES table otherwise vice-versa.

To check view has been created in the current database, we have used once again the SELECT statement to retrieve all records from the STATES_OF_CANADA view with the ORDER BY clause. In the ORDER BY clause, it arranged the records of the STATE_ID column in ascending order by using the ASC keyword as it is shown in the second query.

We believe that by utilizing the MariaDB WHERE condition and GROUP BY clause on the table by the query, you have understood the subtopic “Learning to Create Views in MariaDB Group By Condition.” We’ve used a sample example and gone into great detail to explain it for clarity.

Read: MariaDB Display List of Databases

How to Create Views in MariaDB Group By Having

In this MariaDB subtopic section, we will learn and understand how to create a view on the table by using the MariaDB GROUP BY and HAVING clause in the table by the following query:

EXAMPLE:

CREATE VIEW USA_JH_UNIVERSITY
AS 
SELECT PATIENT_ID,MAX(PATIENT_FIRSTNAME),PATIENT_LASTNAME
FROM JOHNS_HOPKINS_HOSPITAL
WHERE PATIENT_ID<50
GROUP BY PATIENT_ID
HAVING MAX(PATIENT_ID)>1
LIMIT 5;

SELECT * FROM USA_JH_UNIVERSITY;

The CREATE VIEW statement is used in the aforementioned query to create the USA_JH_UNIVERSITY view on the JOHNS_HOPKINS_HOSPITAL database. After then, the SELECT statement was employed, and the AS keyword came next.

In the SELECT statement, it will retrieve all records of the PATIENT_ID and PATIENT_LASTNAME columns from the JOHNS_HOPKINS_HOSPITAL table with the WHERE condition. In the WHERE condition, the PATIENT_ID column is used with the LESS THAN operator to find a value less than 50 from the JOHNS_HOPKINS_HOSPITAL table.

Then we have used the GROUP BY clause on the PATIENT_ID column which will group all records from the JOHNS_HOPKINS_HOSPITAL table. After that, we used the HAVING clause with the MAX function to find the maximum number which should be greater than 1 from the JOHNS_HOPKINS_HOSPITAL table.

In the end, we have used the LIMIT clause as LIMIT 5 to receive the first 5 records from the JOHNS_HOPKINS_HOSPITAL table.

Once the first query has been executed and the view has been created in the current database, we have used the SELECT statement to retrieve all records from the USA_JH_UNIVERSITY view.

We hope that you have understood the subtopic “Learning to Create Views in MariaDB Group By Having” by using the CREATE VIEW statement to create a view on the table and using the GROUP BY clause and HAVING clause in the query. For better illustration, we have used a sample example and defined it in deepness.

Read: MariaDB Set Auto Increment Value

How to Create Views in MariaDB Group By Order

In this MariaDB subtopic tutorial, we will learn and understand how to create a view on the table by using the MariaDB GROUP BY clause and ORDER BY clause in the query, which is explained with the help of a sample example.

In MariaDB, the ORDER BY clause is used to arrange the records of the column_name or expression by the query. If we want to arrange the records in ascending order then use the ASC keyword after the ORDER BY clause and in descending order use the DESC keyword after the clause.

Normally, programmers don’t use the ASC keyword to arrange the records of the column in ascending order. It automatically arranges the records of the table in ascending order without the ASC keyword.

EXAMPLE:

CREATE VIEW USA_HARVARD
AS 
SELECT STUDENT_FIRSTNAME,MAX(STUDENT_LASTNAME) AS MAX_STRINGNAME
FROM HARVARD_UNIVERSITY
WHERE STUDENT_ID>2
GROUP BY STUDENT_FIRSTNAME
ORDER BY STUDENT_LASTNAME DESC,
STUDENT_FIRSTNAME DESC;

SELECT * FROM USA_HARVARD;

On the HARVARD_UNIVERSITY database, we have created a view called USA_HARVARD using the CREATE VIEW statement in the first query. The SELECT statement was then used, and the query’s AS keyword came after it.

All entries with the STUDENT_FIRSTNAME column will be retrieved from the HARVARD_UNIVERSITY table using the SELECT command. The WHERE condition in the MAX function will determine the maximum string name from the STUDENT_LASTNAME column of the HARVARD_UNIVERSITY table.

To shorter the function_name, we have used the ALIAS clause with the AS keyword and given the name MAX_STRINGNAME for the output column name in the result set.

In the WHERE condition, the STUDENT_ID column is used with the GREATER THAN operator to find a value greater than 2 from the HARVARD_UNIVERSITY table. Then we used the GROUP BY clause to arrange the records of the STUDENT_FIRSTNAME column from the HARVARD_UNIVERSITY table.

In the end, we have used the ORDER BY clause to arrange the records of the STUDENT_LASTNAME and STUDENT_FIRSTNAME columns in descending order by using the DESC keyword in the query.

We have used the SELECT statement to retrieve all records from the USA_HARVARD view, which is displayed in the second query after the view has been established in the current database.

The subtopic “Learning to Create Views in MariaDB Group By Order” describes how to use the MariaDB CREATE VIEW statement to create a view on a table using the GROUP BY and ORDER BY clauses on the table by the query. We have thoroughly explained it with an illustrated example to aid in understanding.

You may also like to read the following MariaDB tutorials.

• MariaDB Add Auto Increment Column
• How To Create Views In MariaDB
• How to Delete a Database in MariaDB
• MariaDB Unique Key [Useful Guide]
• MariaDB Select Where Not Empty
• MariaDB Check Empty String

We were able to use the Learning To Create Views In MariaDB Group By after following this lesson’s instructions. We have also looked at a few instances to help you better comprehend the idea. These are the topics that we have covered.

• How can we use the MariaDB GROUP BY clause to generate a view on the table?
• How can we use the COUNT function with MariaDB’s GROUP BY clause to generate a view on the table?
• How can we use the MariaDB WHERE condition and GROUP BY clause to generate a view on the table?
• Using the MariaDB GROUP BY HAVING clause, how do you generate a view on the table?
• How can we utilize the MariaDB GROUP BY and ORDER BY clauses to generate a view on the table?