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What is the role of screenX Mouse Event in JavaScript?

How to work with the screenX mouse event in JavaScript? What is its role and how can I use it correctly in JavaScript?

What is the usage of onpagehide event in JavaScript?

How to work with the onpagehide event in JavaScript? I want to learn its usage and how to work with it effectively?

What is JavaScript Bitwise NOT(~) Operator?

I am working on JavaScript bitwise operators these days. How can I work with Bitwise NOT(~) operator in JavaScript effectively?

Is it a good practice to place all declarations at the top in JavaScript?

I have always wondered how can I get the best out of JavaScript. Should I add all the declaration at the top to load JavaScript quickly?

Set the day of the month for a specified date according to universal time?

Which method or property should I use in JavaScript to set the day of the month for a specified date according to universal time? The following is my Date object: ,

What is the role of Navigator object in JavaScript?

What is the usage of Navigator object in JavaScript? How can I work with it effectively and an example would work great for me in understanding the concept.

How BEFORE INSERT triggers can be used to emulate CHECK CONSTRAINT for inserting values in the table?

As we know that MySQL does not support CHECK CONSTRAINT but I want to know that how it can be imitated with the help of MySQL BEFORE INSERT trigger.

What happens with the trigger when we will drop the table having that trigger?

Suppose if we have a MySQL table and there is a MySQL trigger which is related to this particular table. I want to drop this table but before this want to know that what would happen to the associated trigger after deleting the table.

How can we convert subqueries to LEFT JOIN?

I want to imitate MySQL LEFT JOIN with the help of subqueries. Is it possible to implement?

What MySQL MAKE_SET() function returns if there are all NULL at the place of strings?

Is it possible to pass all the NULLs at the place of strings in MySQL MAKE_SET() function?
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