Are dashes allowed in SQL?
Under SQL-92 table and field names should not: Contain SQL special characters like the hyphen/dash/minus character. Start with non-alphabetic characters like the underscore.
Can database names have dashes?
dash in database name (reply) I put double quotes around the db name, it works fine. So, sometimes you need to put double quotes around the db name.
How do you add notes in SQL?
Comments Within SQL Statements
- Begin the comment with a slash and an asterisk (/*). Proceed with the text of the comment. This text can span multiple lines.
- Begin the comment with — (two hyphens). Proceed with the text of the comment. This text cannot extend to a new line.
How do I add a hyphen between numbers in SQL?
To set a string with hyphen and numbers, you need to use single quotes. For example, ‘Customer-1234-899’, ‘Customer-9383-901’, etc.
What is database explain in brief?
A database is an organized collection of structured information, or data, typically stored electronically in a computer system. A database is usually controlled by a database management system (DBMS). Most databases use structured query language (SQL) for writing and querying data.
How do I select a specific database in mysql?
You can use the SQL command use to select a database.
- Example. Here is an example to select a database called TUTORIALS − [root@host]# mysql -u root -p Enter password:****** mysql> use TUTORIALS; Database changed mysql>
- Syntax. mysqli_select_db ( mysqli $link , string $dbname ) : bool.
- Example.
- Output.
What data type is a hyphen?
1 Answer. With hyphens, it’s a string, full stop! You could store it as a BIGINT (without the hyphens) and format it using the hyphens on the client side – putting hyphens at 4 and 12. However, if the position of the hyphens varies, you’ll have to store it as a string and not any form of number.