To get the first part, use SUBSTRING(). Let us first create a table −mysql> create table DemoTable858(PostCode varchar(100)); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable858 values('US90 456'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable858 values('UK1 EN789343'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable858 values('ENG78884 736454654'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable858;This will produce the following output −+--------------------+ | PostCode           | +--------------------+ | ... Read More

To allow inserting only non-duplicate values, use the UNIQUE constraint. Let us first create a table −mysql> create table DemoTable832(    FirstName varchar(100),    LastName varchar(100),    UNIQUE(FirstName, LastName) ); Query OK, 0 rows affected (0.87 sec)Insert some records in the table using insert command −mysql> insert into DemoTable832 values('John', 'Smith'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable832 values('Adam', 'Smith'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable832 values('John', 'Doe'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable832 values('John', 'Smith'); ERROR 1062 (23000): Duplicate entry 'John-Smith' for key 'FirstName'Above, we ... Read More

To create a table from the view below is the syntax −create table yourTableName select *from yourViewName;Let us first create a table −mysql> create table DemoTable830(Name varchar(100)); Query OK, 0 rows affected (0.91 sec)Insert some records in the table using insert command −mysql> insert into DemoTable830 values('Chris'); Query OK, 1 row affected (0.41 sec) mysql> insert into DemoTable830 values('Robert'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable830 values('David'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable830 values('Mike'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select ... Read More

Use aggregate function SUM() along with REPLACE(). Let us first create a table −mysql> create table DemoTable857(Price varchar(100)); Query OK, 0 rows affected (1.40 sec)Insert some records in the table using insert command −mysql> insert into DemoTable857 values('50.60'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable857 values('40.30.20'); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable857 values('10.20'); Query OK, 1 row affected (0.69 sec)Display all records from the table using select statement −mysql> select *from DemoTable857;This will produce the following output −+----------+ | Price    | +----------+ | 50.60    | | 40.30.20 | | ... Read More

Let us first create a table −mysql> create table DemoTable829(SerialNumber int); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable829 values(100); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable829 values(101); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable829 values(102); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable829 values(103); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable829 values(104); Query OK, 1 row affected (0.60 sec)Display all records from the table using select statement −mysql> select *from DemoTable829;This will produce ... Read More

Let us first create a table −mysql> create table DemoTable856(Title text); Query OK, 0 rows affected (0.89 sec)Insert some records in the table using insert command −mysql> insert into DemoTable856 values('Introduction to MySQL'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable856 values('Java in depth'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable856 values('C++ with Data Structure'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable856;This will produce the following output −+-------------------------+ | Title                   | +-------------------------+ ... Read More

Let us first create a table −mysql> create table DemoTable828(    CustomerName varchar(100),    InterestRate varchar(100) ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable828 values('Chris', '10%'); Query OK, 1 row affected (0.60 sec) mysql> insert into DemoTable828 values('Robert', '11.5%'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable828 values('David', '15.90%'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable828 values('Bob', '20%'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable828;This will produce the following ... Read More

Let us first create a table −mysql> create table DemoTable855(DueDate timestamp); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable855 values('2019-08-07'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable855 values('0000-00-00'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable855 values('2019-07-06'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable855 values('2016-04-10'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable855;This will produce the following output −+----------------------+ | DueDate             ... Read More

To replace backslashes with any other special character, use the REPLACE() method. Let us first create a table −mysql> create table DemoTable827(Path text); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable827 values('C\MySQL'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable827 values('D\NewFolder\'); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable827 values('E:\myFolder\MyDocument'); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select *from DemoTable827;This will produce the following output −+------------------------+ | Path ... Read More

Let us first create a table −mysql> create table DemoTable(Value int); Query OK, 0 rows affected (1.79 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(50); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.68 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+-------+ | Value | +-------+ | 50    | | 20    | | 30    | +-------+ 3 rows in ... Read More