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To update all the entries while ignoring a single value, you need to use IF().Let us first create a table −mysql> create table DemoTable736 ( CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, CustomerName varchar(100), isMarried boolean ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable736(CustomerName, isMarried) values('Chris', 0); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable736(CustomerName, isMarried) values('Robert', 0); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable736(CustomerName, isMarried) values('David', 0); Query OK, 1 row affected (0.24 sec) mysql> insert into ... Read More
To delete multiple entries from a MySQL table, use JOIN. Let us first create a table −mysql> create table DemoTabl(Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100)); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(FirstName) values('Bob'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable(FirstName) values('Bob'); Query OK, 1 row ... Read More
Given a number n, we have to print the steps to make the number as in form of 2^X-1 by using Xor operation.We should XOR the number with any 2^M-1, where M is chosen by you, at odd step. At even step increment the number by 1Keep performing the step until n becomes 2^X-1, and print all the stepsExampleInput: 22 Output: Step 1 : Xor with 15 Step 2: Increase by 1 Step 3 : Xor with 7 Step 4: Increase by 1 Step 5 : Xor with 1 Input:7 Output: No Steps to be performedAlgorithmint ... Read More
To merge rows in MySQL, use GROUP_CONCAT().Let us first create a table−mysql> create table DemoTable734 ( Id int, Name varchar(100) ); Query OK, 0 rows affected (0.73 sec)Insert some records in the table using insert command−mysql> insert into DemoTable734 values(101, 'John'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable734 values(102, 'John'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable734 values(103, 'Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable734 values(104, 'Chris'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable734 values(104, 'Chris'); Query OK, 1 row affected ... Read More
Let us first create a table -mysql> create table DemoTable732 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, PassengerId int, PassengerName varchar(100), PassengerAge int, PassengerTravelDatetime datetime ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command -mysql> insert into DemoTable732(PassengerId, PassengerName, PassengerAge, PassengerTravelDatetime) values(110, 'Chris', 25, '2019-07-23 12:45:56'); Query OK, 1 row affected (0.40 sec) mysql> insert into DemoTable732(PassengerId, PassengerName, PassengerAge, PassengerTravelDatetime) values(120, 'Robert', 24, '2019-07-21 11:05:00'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable732(PassengerId, PassengerName, ... Read More
Let us first create a table:mysql> create table DemoTable731 (Value varchar(100)); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command -mysql> insert into DemoTable731 values('4.50'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable731 values('7.83'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable731 values('8.91'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable731 values('560.34'); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement -mysql> select *from DemoTable731;This will produce the following output -+--------+ | Value | +--------+ | 4.50 ... Read More
For this, use stored procedure. Let us first create a table −mysql> create table DemoTable(Id int, Name varchar(100)); Query OK, 0 rows affected (1.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10, 'John'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(11, 'Chris'); Query OK, 1 row affected (0.41 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+------+-------+ | Id | Name | +------+-------+ | 10 | John | | 11 | Chris | +------+-------+ 2 rows ... Read More
To count days in date range, you need to find the difference between dates using DATEDIFF().Let us first create a table:mysql> create table DemoTable730 ( StartDate date, EndDate date ); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert command:mysql> insert into DemoTable730 values('2019-01-21', '2019-07-21'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable730 values('2018-10-11', '2018-12-31'); Query OK, 1 row affected (0.46 sec) mysql> insert into DemoTable730 values('2016-01-01', '2016-12-31'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement:mysql> select *from DemoTable730;This will produce the following ... Read More
For this, use UNION ALL.Let us first create a table:mysql> create table DemoTable729 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100), MySQLMarks int, CMarks int, JavaMarks int ); Query OK, 0 rows affected (0.40 sec)Insert some records in the table using insert command:mysql> insert into DemoTable729(StudentName, MySQLMarks, CMarks, JavaMarks) values('Chris', 94, 67, 75); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable729(StudentName, MySQLMarks, CMarks, JavaMarks) values('Robert', 45, 99, 54); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable729(StudentName, MySQLMarks, CMarks, JavaMarks) values('David', 57, 89, 43); Query OK, 1 row ... Read More
To calculate power of a number, use POWER() function. Let us first create a table −mysql> create table DemoTable ( Amount int ); Query OK, 0 rows affected (0.89 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(64); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(144); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(400); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+--------+ | Amount | ... Read More