You can use two approaches to know the version of MySQL. In the first approach, you can use version() to know the MySQL Server version. The first approach is as followsSELECT VERSION();In the second approach, you can use SHOW VARIABLES command to know the MySQL version. The second approach is as followsSHOW VARIABLES WHERE Variable_name = 'version';Let us learn about both the syntaxes one by one.Using version()mysql> select version();The following is te output displaying the current version of the MySQL you are using+-----------+ | version() | +-----------+ | 8.0.12 | +-----------+ 1 row in set (0.00 sec)The ... Read More

You can use UNION to get the previous and next record in MySQL.The syntax is as follows(select *from yourTableName WHERE yourIdColumnName > yourValue ORDER BY yourIdColumnName ASC LIMIT 1) UNION (select *from yourTableName WHERE yourIdColumnName < yourValue ORDER BY yourIdColumnName DESC LIMIT 1);To understand the concept, let us create a table. The query to create a table is as followsmysql> create table previousAndNextRecordDemo - > ( - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > Name varchar(30) - > ); Query OK, 0 rows affected (1.04 ... Read More

Yes, it is possible to calculate a correlation in a query. To understand the correlation in a query, you need to first create a table. The query to create a table is as followsmysql> create table correlationDemo - > ( - > value float not null, - > value2 float not null - > ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table with the help of insert command. The query is as follows to insert records in the tablemysql> insert into correlationDemo values(1, ... Read More

Let us first create a table. The query to create a table is as followsmysql> create table selectAllDemo - > ( - > Name varchar(100), - > Age int - > ); Query OK, 0 rows affected (1.90 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into selectAllDemo values('John', 25); Query OK, 1 row affected (0.99 sec) mysql> insert into selectAllDemo values('Carol', 26); Query OK, 1 row affected (0.42 sec) mysql> insert into selectAllDemo values('Bob', 30); Query OK, 1 row affected (1.57 ... Read More

You can use CASE statement to count two different columns in a single query. To understand the concept, let us first create a table. The query to create a table is as follows.mysql> create table CountDifferentDemo    - > (    - > ProductId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    - > ProductName varchar(20),    - > ProductColor varchar(20),    - > ProductDescription varchar(20)    - > ); Query OK, 0 rows affected (1.06 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into CountDifferentDemo(ProductName, ProductColor, ProductDescription) values('Product-1', 'Red', 'Used'); Query OK, 1 row ... Read More

For this, use the substring_index() function.The syntax is as followsselect substring_index(yourColumnName, '. ', -1) AS anyAliasNamefrom yourTableName;Let us first create a table. The query to create a table is as followsmysql> create table AllFiles - > ( - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > UserName varchar(10), - > FileName varchar(100) - > ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into AllFiles(UserName, FileName) values('Larry', 'AddTwoNumber.java'); Query OK, 1 ... Read More

You can achieve this with the help of prepared statement in MySQL. First you need to create a table. The query to create a table is as followsmysql> create table University - > ( - > UserId int, - > UniversityId int - > ); Query OK, 0 rows affected (0.64 sec)At first, let us set values in the above-mentioned columns. Here, we have set a string with comma separated value for UserId column. We will split this and insert in the tablemysql> SET @userId = '8, 9, ... Read More

To get data from MySQL database, you need to use executeQuery() method from java. First create a table in the MySQL database. Here, we will create the following table in the ‘sample’ databasemysql> create table javaGetDataDemo - > ( - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > FirstName varchar(10), - > LastName varchar(10) - > ); Query OK, 0 rows affected (0.80 sec)Now you can insert some records in the table using insert command.The query is as followsmysql> insert into javaGetDataDemo(FirstName, LastName) values('John', 'Smith'); Query OK, 1 row affected (0.19 sec) mysql> insert into javaGetDataDemo(FirstName, LastName) values('Carol', ... Read More

You need to use unsigned for this because it won’t allow you to enter a negative number.The syntax is as followsCREATE TABLE yourTableName ( yourColumnName INT UNSIGNED );To understand the concept, let us create a table. The query to create a table is as followsmysql> create table OnlyPositiveValue - > ( - > Marks int UNSIGNED - > ); Query OK, 0 rows affected (0.58 sec)Before inserting data in the table, use the below query.The query is as followsmysql> SET @@SESSION.sql_mode = 'STRICT_TRANS_TABLES'; Query OK, 0 rows affected, ... Read More

Yes, it is possible to enforce data checking in MySQL using regular expression. First, you need to create a table. After that you need to create a trigger before insert in table. Here, we will be checking the Phone Number format.The query to create a table is as followsmysql> create table enforceDataUsingRegularExpression - > ( - > yourPhoneNumber varchar(60) - > ); Query OK, 0 rows affected (0.59 sec)The query to create a trigger is as followsmysql> DELIMITER // mysql> CREATE TRIGGER enforce_phone_check BEFORE INSERT ON enforceDataUsingRegularExpression - ... Read More