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Which column type should I define to be able to insert and display two forward slashes?

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You may choose any one of the following column types for inserting data which has two forward slashes: CHAR, VARCHAR, URL.

Please check the following example: 

SQL> create table test_str(name char(100), link varchar(100), url string);
SQL> insert into test_str values ('http://www.google.com', 'http://www.gmail.com', 'https://www.hdfcbank.com');
SQL> select * from test_str;
NAME LINK URL
 --------------------- -------------------- ------------------------
http://www.google.com http://www.gmail.com https://www.hdfcbank.com

More information about string types can be found here.

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