Let us first create a table −mysql> create table DemoTable (    FirstName varchar(100),    LastName varchar(100) ); Query OK, 0 rows affected (0.92 sec) mysql> alter table DemoTable add index(FirstName, LastName); Query OK, 0 rows affected (1.00 sec) Records: 0 Duplicates: 0 Warnings: 0Insert some records in the table using insert command −mysql> insert into DemoTable values('Adam', 'Smith'); Query OK, 1 row affected (0.73 sec) mysql> insert into DemoTable values('Adam', 'Smith'); Query OK, 1 row affected (1.17 sec) mysql> insert into DemoTable values('John', 'Doe'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Carol', 'Taylor'); Query OK, ... Read More

For this, use UNION. Let us first create a table −mysql> create table DemoTable (    Name1 varchar(100),    Name2 varchar(100) ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert commandmysql> insert into DemoTable values('Adam', 'Bob'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values('Adam', 'Bob'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('David', 'Chris'); 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 −+-------+-------+ | Name1 | Name2 | +-------+-------+ | ... Read More

For this, use a CASE statement. Let us first create a table −mysql> create table DemoTable (    Value char(1) ); Query OK, 0 rows affected (1.21 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('a'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('b'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('a'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('a'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('b'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable ... Read More

Yes, we can use INTERVAL while inserting data records. Let us first create a table −mysql> create table DemoTable (    ArrivalTime datetime ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command. Here, we are using INTERVAL keyword for incrementing the date records while inserting −mysql> insert into DemoTable values(date_add(now(), interval 4 hour)); Query OK, 1 row affected (0.41 sec) mysql> insert into DemoTable values(date_add('2016-01-31 10:40:50', interval 2 hour)); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(date_add('2015-05-01 12:00:00', interval 1 hour)); Query OK, 1 row affected (0.25 sec) mysql> ... Read More

Yes, you can give the year as a column name in MySQL table since it isn’t a reserved word. Let us first create a table −mysql> create table DemoTable (    Year int ); Query OK, 0 rows affected (0.87 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1995); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(2019); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(2016); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(2018); Query OK, 1 row affected (0.13 sec)Display all records from ... Read More

To concatenate rows on the basis of boolean value in another column, use GROUP_CONCAT(). Let us first create a table. Here, we have set one of the columns “isValidUser” as BOOLEAN −mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    UserMessage varchar(100),    isValidUser boolean ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(UserMessage, isValidUser) values('Hi', true); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable(UserMessage, isValidUser) values('Hello', false); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(UserMessage, isValidUser) values('Good', ... Read More

To ORDER BY letters, use ORDER BY SUBSTRING(). Let us first create a table −mysql> create table DemoTable (    Id varchar(100) ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('456 John Smith'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('897 Adam Smith'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('1009 Bob Smith'); 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 −+----------------+ | Id ... Read More

To fetch the maximum value, use any of the below-given syntaxes −select max(yourColumnName) from yourTableName; OR select *from yourTableName order by yourColumnName desc limit 1;Let us first create a table −mysql> create table DemoTable (    Value int ); Query OK, 0 rows affected (0.84 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(45); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(87); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(56); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(77); Query OK, 1 row affected ... Read More

For alphabetic search, use the REGEX in MySQL. Here, let’s say we are searching for records beginning with A, B or C. The syntax to use REGEXP for the same purpose is as follows −select *from yourTableName where yourColumnName REGEXP '^[ABC]';Let us first create a table −mysql> create table DemoTable (    Name varchar(100) ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Mike'); Query ... Read More

TRIM is used to remove leading and trailing spaces. Let us first create a table −mysql> create table DemoTable (    StudentName varchar(100) ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command. Here, we have inserted records with leading and trailing whitespaces −mysql> insert into DemoTable values(' Adam Smith '); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(' David Miller '); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(' Chris Brown '); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(' Carol ... Read More