MariaDB Check String Length [13 helpful examples]

In this MariaDB tutorial, we will discuss the MariaDB Check String Length function and will look at several examples. There are lists of the topic that comes under discussion:

• MariaDB Check String Length
• MariaDB Check String Length Column
• MariaDB Check String Length Error
• MariaDB Check String Length For Empty
• MariaDB Check String Length Greater Than
• MariaDB Check String Length Group By
• MariaDB Check String Length Is Null
• MariaDB Check String Length JSON String
• MariaDB Check String Length JSON Array
• MariaDB Check String Length Limit
• MariaDB Check String Length Max
• MariaDB Check String Length Min
• MariaDB Check String Length Order By
• MariaDB Check String Length Year

MariaDB Check String Length

Here we will understand and learn how to use the MariaDB LENGTH() function for the string in the query and which is explained with the help of syntax and an illustrated example.

In MariaDB, the LENGTH() function is used to return the length of a string in bytes. Let’s have a look at the string length by using the LENGTH function in the below following query:

SYNTAX:

SELECT LENGTH(COLUMN_NAME| STRING) FROM TABLE_NAME;

The syntax explanation:

• COLUMN_NAME | STRING: The string whose length will be returned.

NOTE:

• When we use the LENGTH function, a multi-byte character is counted as more than one byte. And the LENGTH version can be used in MariaDB 10 version.

Here is an illustrated example of the LENGTH function for finding string length in the below following query:

EXAMPLE:

SELECT LENGTH(WEB_SITES_NAME) AS NAME_LENGTH ,WEB_SITES_NAME FROM USA_PROGRAMMING_CLASS;

• In the preceding query, the SELECT statement is used to retrieve the length of the WEB_SITES_NAME column by using the LENGTH function.
• And selected the records of the WEB_SITES_NAME column from the USA_PROGRAMMING_CLASS table.
• We have also used the alias_clause with AS keyword to shorter the name of the LENGTH(WEB_SITES_NAME) column as the NAME_LENGTH column.

In this sub-topic, we have learned how to use the MariaDB LENGTH function for checking the string length in the table query.

Read: MariaDB Not Between

MariaDB Check String Length Column

Here we will use the MariaDB LENGTH function on the column for calculating the string’s length and which is explained with the help of an illustrated example.

EXAMPLE:

SELECT LENGTH(STATE_NAME) AS NAME_LENGTH, STATE_NAME FROM STATES_OF_USA
LIMIT 10;

As we see in the preceding query, we have used the LENGTH function on the STATE_NAME column. And we have also used the ALIAS clause to shorter the name of the function as the NAME_LENGTH column.

We select the records of the STATE_NAME column from the STATES_OF_USA table with LIMIT 10 for getting the first 10 records of the STATES_OF_USA table.

In this section, we have learned how to use the MariaDB LENGTH function on the column and to check the string length from that column.

Read: MariaDB Median

MariaDB Check String Length Error

We will see the error of the MariaDB LENGTH function for checking the string length in the query and which is explained with the help of an illustrated example.

In MariaDB, the error arises in the LENGTH function when we carry the no parameter or column_name from the table in the query. Let’s see an error of the LENGTH function by the following query:

ERROR EXAMPLE:

SELECT LENGTH( ), FIRST_NAME FROM MIT_STUDENTS;

In the preceding query, we get the error for the LENGTH function because there is no string in the parameter of expression or column_name. Due to this query didn’t execute for the MIT_STUDENTS table.

EXAMPLE:

SELECT LENGTH(FIRST_NAME),FIRST_NAME FROM MIT_STUDENTS
LIMIT 10;

As we see in the above query, we used the LENGTH function on the FIRST_NAME column to find the string length. And selected the records of the FIRST_NAME column from the MIT_STUDENTS by using the SELECT statement.

At the end of the query, we have used the LIMIT clause as LIMIT 10 to retrieve the first 10 records from the MIT_STUDENTS table by using the SELECT statement.

In this process, we have learned and understood how the error arises in the MariaDB LENGTH function in the query. And we have also explained with the help of an example how to remove the MariaDB LENGTH error from the query.

Read: MariaDB Not Equal Operator

MariaDB Check String Length For Empty

We will understand and learn how to use the MariaDB LENGTH function with the WHERE condition of the column. And we will check the string length of empty by using the LENGTH function and which is explained with the help of an example.

EXAMPLE:

SELECT LENGTH(FRIST_NAME),FIRST_NAME FROM MIT_STUDENTS
WHERE FIRST_NAME= '';

As we see in the above query, we retrieve the length of the string in the FIRST_NAME column by using the LENGTH function. And select the records of the FIRST_NAME column from the MIT_STUDENTS table based on the WHERE condition.

In the WHERE condition, the FIRST_NAME column contains an empty string. Once the WHERE condition is TRUE then we get records from the MIT_STUDENTS table.

In this section, we have understood how to use the MariaDB LENGTH function with the WHERE condition for the empty string.

Read: MariaDB COUNT Function

MariaDB Check String Length Greater Than

We will learn and understand how to use the MariaDB LENGTH with the GREATER THAN operator in the query. And it’s explained with the help of an illustrated example.

In MariaDB, the GREATER THAN operator is used to test the expression or column_name for the greater than from the query in the output.

EXAMPLE:

SELECT LENGTH(FIRST_NAME),FIRST_NAME FROM MIT_STUDENTS
WHERE MATHS> 50;

In the preceding query, we used the LENGTH function on the FIRST_NAME column. And we retrieve records of the FIRST_NAME column from the MIT_STUDENTS table based on the WHERE condition.

In the WHERE condition, we used the GREATER THAN operator to find the value greater than 50 from the MATHS column in the MIT_STUDENTS table. Once the WHERE condition gets TRUE, then we get records from the MIT_STUDENTS table.

We have learned and understood, how to use the MariaDB LENGTH function with GREATER THAN operator from the above example is a very clear way.

Read: MariaDB GROUP BY

MariaDB Check String Length Group By

We’ll learn how to utilize the MariaDB LENGTH function also with the GROUP BY clause in a query in this sub-topic, which is described with an illustrated 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 an illustrated example of the MariaDB LENGTH function with the GROUP BY clause in the below following query:

EXAMPLE:

SELECT LENGTH(FIRST_NAME),FIRST_NAME, PHYSICS FROM MIT_STUDENTS
GROUP BY FIRST_NAME;

• In the preceding query, we used the LENGTH function on the FIRST_NAME column to find the length of the string by using the SELECT statement.
• And we selected all records of the FIRST_NAME column from the MIT_STUDENTS table.
• At the end of the query, we grouped them by the FIRST_NAME column by using the GROUP BY clause.

In this above section, we have learned how to use the MariaDB LENGTH function with the GROUP BY clause and we have tried to explain it with the help of an example.

Read: MariaDB Max Connections

MariaDB Check String Length Is Null

This sub-topic explains how to utilize the MariaDB LENGTH function in conjunction with the IS NULL condition in a query, with an illustrated example.

In MariaDB, the IS NULL condition is used to test the NULL value in the column_name or expression of the SELECT statement. And it is also used in the INSERT, DELETE and UPDATE statements.

Let’s have a look at the sample example of the MariaDB LENGTH function with the IS NULL condition by the following query:

EXAMPLE:

SELECT LENGTH(FIRST_NAME),FIRST_NAME, PHYSICS FROM MIT_STUDENTS
WHERE PHYSICS IS NULL;

We utilized the LENGTH function on the FIRST_NAME column in the MariaDB SELECT statement of the aforementioned query.

With the WHERE condition, we selected entries from the MIT_STUDENTS table that included the FIRST_NAME column. Using the IS NULL criterion in the WHERE condition, the PHYSICS columns contain NULL values.

If the WHERE condition is TRUE, the SELECT operation will obtain all records from the MIT_STUDENTS table.

In this sub-topic, we have learned and understood how to use the MariaDB LENGTH function with IS NULL condition. And we have tried to explain it with an example query.

Read: What is MariaDB Sharding

MariaDB Check String Length JSON String

In this section, we will use the method of the MariaDB LENGTH function with the JSON data type in the query. And it’s explained with the help of an example.

The MariaDB JSON is an alias for LONGTEXT that was created to make it compatible with MySQL’s JSON data type. Because the JSON data format violates the MariaDB standard, MariaDB implements it as a LONGTEXT instead, and MariaDB’s benchmarks show that performance is at least similar. 

SELECT LENGTH(USER_NAME),USER_NAME FROM JSON_DEMO;

In the preceding query, we have used the LENGTH function on the USER_NAME column which is used to find the length of the USER_NAME column. And we have selected records of the USER_NAME column from the JSON_DEMO table by using the SELECT statement.

In this section, we have made it easier to explain the process of the MariaDB LENGTH function with the JSON column as an example.

Read: MariaDB Rename Index

MariaDB Check String Length JSON Array

Here we will understand how to use the MariaDB LENGTH function with the JSON Array column. And it is explained with the help of an illustrated example.

In MariaDB, to create a JSON column for an array then we use the JSON data type while creating a table. For JSON array, it uses an ordered list of values. We can store boolean, number, string, or object in the array.

Here is a sample example of the MariaDB LENGTH function on the JSON array column by the following query:

EXAMPLE:

SELECT LENGTH(JSON_VALUE),JSON_VALUE FROM JSON_DEMO;

In the preceding query, we have used the LENGTH function on the JSON_VALUE column which is used to find the length of the JSON_VALUEcolumn. And we have selected records of the USER_NAME column from the JSON_DEMO table by using the SELECT statement.

In this section, we have used an example for easy understanding of the MariaDB LENGTH function on the JSON data type.

Read: MariaDB Queries – Detailed Guide

MariaDB Check String Length Limit

We’ll go through using the MariaDB LENGTH method also with a LIMIT clause in the query in this article. With the guidance of a detailed example, it will be simple to explain.

The MariaDB LIMIT clause is used to get records through one or more MariaDB tables and set restrictions on the number of items returned. Here is an example of the LENGTH function with the LIMIT clause by the following query:

EXAMPLE:

SELECT LENGTH(FIRST_NAME),FIRST_NAME, PHYSICS FROM MIT_STUDENTS
LIMIT 5;

In the preceding query, we used the LENGTH function on the FIRST_NAME column. And we have selected the record of the FIRST_NAME and PHYSICS column from the MIT_STUDENTS table.

At the end of the query, we have used the LIMIT clause as LIMIT 5 to retrieve the first 5 records from the MIT_STUDENTS table by using the SELECT statement.

For the sake of clarity, we utilized an example of the MariaDB LENGTH function with the LIMIT clause in the query in this article.

Read: MariaDB ENUM – Helpful Guide

MariaDB Check String Length Max

In this section, we will learn how to use the MariaDB LENGTH function with the MAX function in the query. And it will be explained with the help of an illustrated example.

In MariaDB, the MAX function is used to return the max value from the expression or column_name in the query. Let’s see an example of the MariaDB LENGTH function with the MariaDB MAX function by the following query:

EXAMPLE:

SELECT LENGTH(FIRST_NAME),MAX(FIRST_NAME),FIRST_NAME,PHYSICS FROM MIT_STUDENTS;

In this query, we have used the LENGTH function on the FIRST_NAME column which will help to find the length of the string in the FIRST_NAME column. And we have also used the MAX function on the FIRST_NAME column to find the max string value in this column.

After that, we selected the records of the FIRST_NAME and PHYSICS column from the MIT_STUDENTS table by using the SELECT statement.

We used the preceding example in this part to better understand MariaDB’s LENGTH function in conjunction with the MAX function in the query.

Read: MariaDB If Null + Examples

MariaDB Check String Length Min

In this section, we will learn how to use the MariaDB LENGTH function with the MIN function in the query. And it will be explained with the help of an illustrated example.

In MariaDB, the MIN function is used to return the min value from the expression or column_name in the query. Let’s see an example of the MariaDB LENGTH function with the MariaDB MAX function by the following query:

EXAMPLE:

SELECT LENGTH(FIRST_NAME),MIN(FIRST_NAME),FIRST_NAME,PHYSICS FROM MIT_STUDENTS;

In this query, we have used the LENGTH function on the FIRST_NAME column which will help to find the length of the string in the FIRST_NAME column. And we have also used the MIN function on the FIRST_NAME column to find the min string value in this column.

After that, we selected the records of the FIRST_NAME and PHYSICS column from the MIT_STUDENTS table by using the SELECT statement.

If we see in the below image of the above query, then it will not provide any string name whose is minimum value from the MIT_STUDENTS table.

We used the preceding example in this part to better understand MariaDB’s LENGTH function in conjunction with the MIN function in the query.

Read: MariaDB Drop Table

MariaDB Check String Length Order By

We will learn and understand how to use the MariaDB LENGTH function with the ORDER BY clause and which is explained with the help of an illustrated example.

The MariaDB ORDER BY clause is used to return a set of expressions from the query in ascending or descending order. We can use the ASC or DESC keyword with the ORDER BY clause.

NOTE:

Most programmers normally don’t use the ASC keyword with the ORDER BY clause because the MariaDB will automatically arrange it in ascending order for the output.

Let’s have a look at the example of the MariaDB LENGTH function with the ORDER BY clause in the below following query:

EXAMPLE:

SELECT LENGTH(FIRST_NAME),FIRST_NAME, PHYSICS FROM MIT_STUDENTS
ORDER BY FIRST_NAME DESC;

In the preceding query, we have used the MariaDB LENGTH function on the FIRST_NAME column which will help to find the string length from this column. And we have also selected the records of the FIRST_NAME and PHYSICS column from the MIT_STUDENTS table.

At the end of the query, we have used the ORDER BY clause is used to arrange the FIRST_NAME column from the MIT_STUDENTS table by using the SELECT statement.

We utilized an example of the MariaDB LENGTH function with the ORDER BY clause in the above query to make this tutorial easier to follow. We hope that the above explanation of the MariaDB LENGTH function and the ORDER BY clause were helpful.

Read: MariaDB Temporary Table

MariaDB Check String Length Year

Here we will understand and learn how to use the method of the MariaDB LENGTH function with the YEAR function in the query. And we will explain it with the help of an illustrated example.

In MariaDB, the YEAR function is used to find the year value from the expression or column_name in the query. The expression for the YEAR function return in YYYY for the output.

We will see an illustrated example of the MariaDB LENGTH function with the YEAR function by the following query:

EXAMPLE:

SELECT FIRST_NAME,LENGTH(YEAR(CURRENT_DATE)) AS YEAR_LENGTH FROM EMPLOYEE
LIMIT 10;

In this preceding query, we have selected the records of the FIRST_NAME column from the EMPLOYEE table by using the SELECT statement. And we have used the YEAR function on the CURRENT_DATE column to calculate the year value from it.

Then we used the LENGTH function on the YEAR(CURRENT_DATE) method to calculate the length of the year from it.

As to shorter the name of the function, we have used the alias clause with AS keyword and changed the name of the function to the YEAR_LENGTH column for the result set.

At the end of the query, we have used the LIMIT clause as LIMIT 10 to get the first 10 records from the EMPLOYEE table by using the SELECT statement.

In this section, we’ve taken an example from the previous section to explain how to utilize the MariaDB LENGTH function with the YEAR function in a query.

Also, take a look at some more MariaDB tutorials.

• MariaDB Date Add Days
• MariaDB See If Table Exists
• MariaDB Date Allow Null
• MariaDB Select Unique
• MariaDB Enable Remote Access
• MariaDB Select Where Not Empty
• MariaDB Truncate Table + Examples
• MariaDB Rename Column + Examples

We addressed the MariaDB Check String Length function in this MariaDB tutorial, as well as several sample instances connected to it. There are lists of the topic that comes under discussion:

• MariaDB Check String Length
• MariaDB Check String Length Column
• MariaDB Check String Length Error
• MariaDB Check String Length For Empty
• MariaDB Check String Length Greater Than
• MariaDB Check String Length Group By
• MariaDB Check String Length Is Null
• MariaDB Check String Length JSON String
• MariaDB Check String Length JSON Array
• MariaDB ChecStringnb Length Limit
• MariaDB Check String Length Max
• MariaDB Check String Length Min
• MariaDB Check String Length Order By
• MariaDB Check String Length Year