To remove unnecessary whitespaces, use TRIM() in MySQL. Let us first create a −mysql> create table DemoTable1405    -> (    -> FirstName varchar(20),    -> LastName varchar(20)    -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert −mysql> insert into DemoTable1405 values(' ... Read More

Let us first create a −mysql> create table DemoTable1619    -> (    -> ArrivalTime datetime    -> ); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert −mysql> insert into DemoTable1619 values(now()); Query OK, 1 row affected (0.40 sec) mysql> insert into DemoTable1619 values(curdate()); ... Read More

For this, you can use INET_ATON(). Let us first create a −mysql> create table DemoTable1404    -> (    -> IpAddress varchar(40)    -> ); Query OK, 0 rows affected (1.02 sec)Insert some records in the table using insert −mysql> insert into DemoTable1404 values('192.168.120.0'); Query OK, 1 row affected (0.43 ... Read More

You cannot use UPDATE command with ORDER BY clause, but you can use SELECT statement with ORDER BY DESC.Let us first create a −mysql> create table DemoTable1403    -> (    -> DueDate timestamp    -> ); Query OK, 0 rows affected (1.26 sec)Insert some records in the table using ... Read More

For this, you can use substring() function in MySQL. For conditions, use MySQL CASE statement. Let us first create a −mysql> create table DemoTable1402    -> (    -> EmployeeName varchar(40)    -> ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert −mysql> insert ... Read More

Backticks would work if written correctly as in the below syntax −update `yourTableName` set `yourTableName`.`yourColumnName`='yourNewValue' where yourCondition;Let us first create a −mysql> create table `DemoTable_1401`    -> (    -> Name varchar(20)    -> ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert −mysql> ... Read More

Each relation may have one or more candidate key. One of these candidate keys is called Primary Key. Each candidate key qualifies for Primary Key. Therefore, candidates for Primary Key is called Candidate Key. To implement candidate key in MySQL, set more than one column as unique key. These keys ... Read More

No, it is possible to get the next primary key without adding a new record. Let us first create a −mysql> create table DemoTable1399    -> (    -> StudentId int NOT NULL AUTO_INCREMENT,    -> PRIMARY KEY(StudentId)    -> ); Query OK, 0 rows affected (0.53 sec)Insert some records ... Read More

Let us first create a −mysql> create table DemoTable1398    -> (    -> Marks int    -> ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert −mysql> insert into DemoTable1398 values(78); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1398 values(82); ... Read More

For date comparison, you can use STR_TO_DATE(). Following is the syntax −select * from yourTableName where str_to_date(yourColumnName, 'yourFormatSpecifier') > curdate();Let us first create a −mysql> create table DemoTable1397    -> (    -> AdmissionDate varchar(40)    -> );s Query OK, 0 rows affected (0.97 sec)Insert some records in the table ... Read More