You can use ORDER BY clause for this. Let us first create a table −mysql> create table DemoTable (    FirstName varchar(200) ); Query OK, 0 rows affected (0.93 sec)Insert records in the table using insert command −mysql> insert into DemoTable values('Larry'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Carol'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Sam'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values('Mike'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.18 sec)Display records from the ... Read More

You can use CASE statement with UPDATE command for this. Let us first create a table −mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Value int ); Query OK, 0 rows affected (1.44 sec)Insert records in the table using insert command −mysql> insert into DemoTable(Value) values(100); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable(Value) values(0); Query OK, 1 row affected (4.16 sec) mysql> insert into DemoTable(Value) values(104); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(Value) values(0); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Value) values(5); Query ... Read More

To store date in MySQL, use the STR_TO_DATE() method −insert into yourTableName values(STR_TO_DATE('yourDate', '%d/%m/%Y'));Let us first create a table −mysql> create table DemoTable (    AdmissionDate date ); Query OK, 0 rows affected (0.62 sec)Insert records in the table using insert command −mysql> insert into DemoTable values(STR_TO_DATE('10/01/2013', '%d/%m/%Y')); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(STR_TO_DATE('31/01/2015', '%d/%m/%Y')); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(STR_TO_DATE('23/04/2019', '%d/%m/%Y')); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(STR_TO_DATE('01/03/2019', '%d/%m/%Y')); Query OK, 1 row affected (0.48 sec)Display records from the table using select ... Read More

Let us first create a table. Here, we have set UserId as AUTO_INCREMENT PRIMARY KEY −mysql> create table DemoTable (    UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY ); Query OK, 0 rows affected (0.72 sec)Following is the query to set int column to auto increment by 1 beginning at 10000 −mysql> alter table DemoTable AUTO_INCREMENT=10000; Query OK, 0 rows affected (0.31 sec) Records: 0 Duplicates: 0 Warnings: 0Insert records in the table using insert command −mysql> insert into DemoTable values(); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.19 sec) ... Read More

To order by from highest to lowest value, you can use ORDER BY DESC command −select *from yourTableName order by yourColumnName DESC;If you want the result from lowest to highest, you can use ORDER BY ASC command −select *from yourTableName order by yourColumnName ASC;Let us first create a table −mysql> create table DemoTable (    Value int ); Query OK, 0 rows affected (0.56 sec)Insert records in the table using insert command −mysql> insert into DemoTable values(134); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(245); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable ... Read More

You can use DELETE command with some condition for this since we need to keep one record and delete rest of the duplicate records.Let us first create a table −mysql> create table DemoTable (    StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    StudentName varchar(40) ); Query OK, 0 rows affected (0.48 sec)Insert records in the table using insert command −mysql> insert into DemoTable(StudentName) values('John'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(StudentName) values('Carol'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(StudentName) values('Sam'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable(StudentName) ... Read More

To select from a set of integers, you can use UNION. Following is the syntax −SELECT yourValue1 UNION SELECT yourValue2 UNION SELECT yourValue3 UNION SELECT yourValue4 . . . . NLet us implement the above syntax to select from a set of integers in MySQL −mysql> SELECT 1000 UNION SELECT 2000 UNION SELECT 3000 UNION SELECT 4000 UNION SELECT 5000 UNION SELECT 6000 UNION SELECT 7000;This will produce the following output −+------+ | 1000 | +------+ | 1000 | | 2000 | | 3000 | | 4000 | | 5000 | | 6000 | | 7000 | +------+ 7 rows in set (0.03 sec)

To replace dot with comma on SELECT, you can use REPLACE(). Following is the syntax −select replace(yourColumnName, '.' , ', ' ) from yourTableName;Let us first create a table −mysql> create table DemoTable (    Value float ); Query OK, 0 rows affected (0.63 sec)Insert records in the table using insert command −mysql> insert into DemoTable values(4.56); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(456.23); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(1078.3); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(2000.50); Query OK, 1 row affected (0.26 sec) mysql> ... Read More

You can use ENUM datatype for this. Let us first create a table −mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    UserRating ENUM('1', '2', '3', '4', '5') ); Query OK, 0 rows affected (0.54 sec)Insert records in the table using insert command −mysql> insert into DemoTable(UserRating) values('5'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(UserRating) values('3'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(UserRating) values('1'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(UserRating) values('3'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable(UserRating) values('4'); ... Read More

You can use LIMIT for this, which is used to fetch limited number of records. Let us first create a table −mysql> create table DemoTable (    Id int,    Name varchar(20) ); Query OK, 0 rows affected (0.53 sec)Insert records in the table using insert command −mysql> insert into DemoTable values(10, 'John'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(11, 'Chris'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(12, 'David'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(13, 'Carol'); Query OK, 1 row affected (0.13 sec) mysql> ... Read More