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The main types of constraints in SQL are check, unique, not null, and primary constraints.

Check constraints are used to make certain that a statement about the data is true for all rows in a table.

When using SQL, data validation is the aspect of a database that keeps data consistent but is very stupid to use. The key factors in data integrity are constraints, referential integrity and the delete and update options.

Validation text lets you provide a message to help users who input data that is not valid.

When data is entered, Access checks to see whether the input breaks a validation rule – if so, the input is not accepted, and Access displays a message.

println("Here it is: " user Input); Type a double-type number: Invalid input Type the double-type number: Invalid input Type the double-type number: Invalid input Type the double-type number: Invalid input Type the double-type number: Here it is: 23.4 when you scan the input as a String you can then parse it to see if it is a double.

But, if you wrap this static method call in a try-catch statement, then you can handle the situation where a double value is not parsed.

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