MariaDB Show Column Data Type

This MariaDB tutorial will discuss the execution of the MariaDB Show Column Data Type. Here we will discuss and draw lessons from several cases to help you comprehend the subject better. The whole list of subjects we’ll discuss is provided below.

  • MariaDB Show Column Data Type
  • MariaDB Show Column Data Type From Table
  • MariaDB Show Column Data Type in SQL
  • MariaDB Show Column Data Type From Database
  • MariaDB Show Column Data Type From Database Where Not Null
  • MariaDB Show Column Data Type From Database With Default Value

MariaDB Show Column Data Type

Here we will learn and understand how to show the column data type of the table by the query, which will be explained with the help of syntax and an example.

In MariaDB, the SHOW COLUMNS statement is used to display information of the column with the data type in the given table. And it also works as a view. The LIKE clause, if present on its own, indicates which column names to match. The WHERE and LIKE clauses can be given to select rows using more general conditions, as discussed in the Extended SHOW statement.

The DESC statement works as same and provides the column data type of a given table by the query.

Let’s see the syntax to show the column data type of a given table in MariaDB by the following query:

SYNTAX:

SHOW COLUMNS FROM [DB_NAME].YOUR_TABLE_NAME;

In the syntax explanation:

  • DB_NAME: It refers to the current_database with the given table which will help to show columns datatype by using the SHOW COLUMNS statement. And it is optional to use in the query.

Let’s see an example of how to show column data type from the table by the following query:

EXAMPLE:

SHOW COLUMNS FROM AIRBNB_DB. STATES_OF_USA ;

As we see in the above query, we have used the SHOW COLUMNS statement to show columns from the STATES_OF_USA table from the current database as AIRBNB_DB. We can also use the DESC statement with the contemporary table which will describe the current table by the query.

MariaDB show column data type example
Example of MariaDB Show Column Data Type

We hope that you have understood the subtopic “MariaDB Show Column Data Type” by using the MariaDB SHOW COLUMNS statement on the table by the query. For a better explanation, we have used an example and explained it in depth.

Read: MariaDB Order By Multiple Columns

MariaDB Show Column Data Type From Table

In this MariaDB subtopic section, we will learn and understand how to show column data types from the table by the following query:

EXAMPLE:

SHOW COLUMNS FROM AIRBNB_DB.JOHNS_HOPKINS_HOSPITAL;

In the aforementioned query, we have used the SHOW COLUMNS statement to show columns with the all datatypes like (INT, VARCHAR, DATE, or DATETIME, etc) from the JOHNS_HOPKINS_HOSPITAL table.

And it is also used the CURRENT_DATABASE as AIRBNB_DB for optional which might help to see column datatype from the JOHNS_HOPKINS_HOSPITAL table.

MariaDB show column data type from table example
Example of MariaDB Show Column Data Type From table

We hope that you have understood how to show column data types from a table by using the MariaDB SHOW COLUMNS from the table by the query. For a better illustration, we have used a sample example and demonstrated it in depth.

Read: MariaDB Alter Table If Exists

MariaDB Show Column Data Type in MySQL Server

We will learn and understand how to show column data type in MySQL Server client by the following query:

EXAMPLE:

SHOW COLUMNS FROM WALMART_CUSTOMER;

In the above query, we have used the SHOW COLUMNS statement which gives detail of the columns with their data type in the WALMART_CUSTOMER table. If we want to use any other way to show the column data type of a given table, then we will use the DESC statement.

MariaDB show column data type in MySQL server example
Example of MariaDB Show Column Data Type in MySQL Server

We hope that you have understood the subtopic “MariaDB Show Column Data Type in MySQL Server” by using the MariaDB SHOW COLUMNS statement on the table by the query. For a better explanation, we have used an example and explained it in deepness.

Read: MariaDB If statement in Select

MariaDB Show Column Data Type From Database

In this MariaDB section, we will learn and understand how to show column data types from the current database by the following query:

EXAMPLE:

SELECT 
    TABLE_NAME,
    COLUMN_NAME, 
    DATA_TYPE, 
    CHARACTER_MAXIMUM_LENGTH AS MAX_LENGTH
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_SCHEMA = DATABASE();

In the above query, we have used the SELECT statement to retrieve all records of the TABLE_NAME, COLUMN_NAME, DATA_TYPE, and CHARACTER_MAXIMUM_LENGTH columns from the INFORMATION_SCHEMA.COLUMNS table with the WHERE condition.

In the WHERE condition, the TABLE_SCHEMA column is used with the EQUAL TO operator to find a current_database and show a list of all columns of all tables by the query.

If the WHERE condition turns out to be TRUE then the SELECT statement will retrieve all records from the INFORMATION_SCHEMA.COLUMNS table otherwise vice-versa. In the CHARACTER_MAXIMUM_LENGTH column, it will provide the maximum value of all data_types which has been used with all tables.

In the end, we have used the ALIAS clause with the AS keyword to shorter the column name and given name as MAX_LENGTH column in the output result set. It might show the SHOW WARNINGS statement because of the above query.

MariaDB show column data type from database example
Example of MariaDB Show Column Data Type From Database

We hope that you have understood the subtopic “MariaDB Show Column Data Type From Database” by using the SELECT statement in the INFORMATION_SCHEMA table. For a better understanding, we have used an example and explained it in deepness.

Read: MariaDB Select Unique

MariaDB Show Column Data Type From Database Where Not Null

In this MariaDB subtopic section, we will learn and understand how to show column data type from the database with the WHERE condition and IS NOT NULL condition on the INFORMATION_SCHEMA table by the query.

EXAMPLE:

SELECT 
    TABLE_NAME,
	 COLUMN_NAME, 
    DATA_TYPE, 
    CHARACTER_MAXIMUM_LENGTH AS MAX_LENGTH
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_SCHEMA = DATABASE()
AND CHARACTER_MAXIMUM_LENGTH IS NOT NULL;

In the aforementioned query, the SELECT statement is used to retrieve all records of the TABLE_NAME, COLUMN_NAME, DATA_TYPE, and CHARACTER_MAXIMUM_LENGTH columns from the INFORMATION_SCHEMA.COLUMNS table with the WHERE condition.

In the WHERE condition, the TABLE_NAME is used with the EQUAL TO operator on the DATABASE function to find current_database and in the CHARACTER_MAXIMUM_LENGTH column is used with the IS NOT NULL condition to find the NOT NULL value in that column of the INFORMATION_SCHEMA.COLUMNS table.

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

MariaDB show column data type from database where not null example
Example of MariaDB Show Column Data Type From Database Where Not Null

We hope that you have understood the subtopic “MariaDB Show Column Data Type From Database Where Not Null” by using the MariaDB SELECT statement on the table by the query. We have used an example and explained it in depth, for better understanding.

Read: MariaDB Select Unique

MariaDB Show Column Data Type From Database With Default Value

We will learn and understand how to show column data type from the database with the default data type by the following query:

EXAMPLE:

SELECT 
    TABLE_NAME,COLUMN_NAME,DATA_TYPE,COLUMN_DEFAULT
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_SCHEMA = DATABASE() AND COLUMN_DEFAULT IS NULL;

In the aforementioned query, the SELECT statement is used to retrieve all records from the TABLE_NAME, COLUMN_NAME, DATA_TYPE, and COLUMN_DEFAULT columns from the INFORMATION_SCHEMA.COLUMNS table with the WHERE condition.

In the WHERE condition, the TABLE_SCHEMA column is used with the EQUAL TO operator on the DATABASE function which will work on the current_database, and the COLUMN_DEFAULT column is used with IS NULL condition to find the NULL value of all columns in all tables by the query.

If the SELECT statement retrieves all records of the INFORMATION_SCHEMA.COLUMNS table only when the WHERE condition turns out to be TRUE. But if the WHERE condition gets a FALSE value only when the SELECT statement gets executed successfully and retrieves an empty record set from the table by the query.

There is a chance to get warning signs as per query and might show the SHOW WARNINGS statement in the result set.

MariaDB show column data type from database where not null example
Example of MariaDB Show Column Data Type From Database With Default Value

We hope that you have understood the subtopic “MariaDB Show Column Data Type From Database With Default Value” by using the MariaDB SELECT statement by the query. For a better description, we have used an example and presented it in deepness.

You may also like to read the following MariaDB tutorials.

By the end of this MariaDB tutorial to might understand the use of MariaDB Show Column DataType reading this lesson. We also discussed a few instances to help you comprehend the concept. Below is a list of all the topics we’ve covered.

  • MariaDB Show Column Data Type
  • MariaDB Show Column Data Type From Table
  • MariaDB Show Column Data Type in SQL
  • MariaDB Show Column Data Type From Database
  • MariaDB Show Column Data Type From Database Where Not Null
  • MariaDB Show Column Data Type From Database With Default Value