What does float a 35 0.0 F return mean?

How do you express infinity in Java?

Use Double to Implement Infinity in Java The Double class in Java supports infinity. You can implement positive infinity or negative infinity.

Which exception is represented by the expression 1 0?

But this is all by the by. The fact is that 1/0 is valid Java code, and no Java compiler should ever flag this as a compilation error.

What is an ArithmeticException?

ArithmeticException is an unchecked exception in Java. Usually, one would come across java. lang. ArithmeticException: / by zero which occurs when an attempt is made to divide two numbers and the number in the denominator is zero. ArithmeticException objects may be constructed by the JVM.

Why do we use finally block?

We generally use the finally block to execute clean up code like closing connections, closing files, or freeing up threads, as it executes regardless of an exception. Note: try-with-resources can also be used to close resources instead of a finally block.

Which character below is not allowed in an identifier?

Answer: a. Explanation: Java identifiers cannot have the characters ! , ' or - in them making answer c, d and e wrong. The word class is a reserved word in Java and cannot be used as an identifier.

Which is the valid identifier?

A valid identifier can have letters (both uppercase and lowercase letters), digits and underscores. The first letter of an identifier should be either a letter or an underscore. You cannot use keywords like int , while etc. as identifiers.

What is identifier with example?

while. An identifier is nothing but a name assigned to an element in a program. Example, name of a variable, function, etc. Identifiers are the user-defined names consisting of 'C' standard character set. As the name says, identifiers are used to identify a particular element in a program.

Which identifier is valid in Rdbms?

C. D. The correct answer is A. The answer customer_12 starts with a character, is less than 30 characters, and uses an underscore and a number within the identifier, and so fits well with all the naming conventions and is a valid identifier.

Which identifier is valid in PL SQL?

You can use uppercase, lowercase, or mixed case to write identifiers. PL/SQL is not case-sensitive except within string and character literals. Every character, including dollar signs, underscores, and number signs, is significant.

What is the use of lock table query?

The LOCK TABLE statement allows you to explicitly acquire a shared or exclusive table lock on the specified table. The table lock lasts until the end of the current transaction. To lock a table, you must either be the database owner or the table owner.

Which three of the following are implicit cursor attributes?

The latest implicit cursor is called the SQL cursor and has the attributes like %FOUND, %ISOPEN, %NOTFOUND, and %ROWCOUNT.

What can a cursor FOR loop use?

The cursor FOR LOOP statement implicitly declares its loop index as a record variable of the row type that a specified cursor returns, and then opens a cursor. With each iteration, the cursor FOR LOOP statement fetches a row from the result set into the record.

What are implicit cursors?

Implicit cursors are automatically created by Oracle whenever an SQL statement is executed, when there is no explicit cursor for the statement. ... For INSERT operations, the cursor holds the data that needs to be inserted. For UPDATE and DELETE operations, the cursor identifies the rows that would be affected.

Which is not a feature of cursor FOR loop?

Implicit cursors are no longer a feature in Oracle. ... None, cursor for loops handle cursor opening implicitly.

What is an implicit cursor FOR loop statement?

The cursor FOR LOOP implicitly creates its loop index as a record variable with the row type in which the cursor returns and then opens the cursor. ... The cursor is also closed if a statement inside the loop transfers control outside the loop, e.g., EXIT and GOTO , or raises an exception.

What is difference between cursor and while loop?

Cursors in sql server allow you to fetch a set of data, loop through each record, and modify the values as necessary; then, you can easily assign these values to variables and perform processing on these values. While loop also same as cursor to fetch set of data and process each row in sql server.

How do you execute a trigger?

We can create more than one trigger for the same event (in other words an INSERT, DELETE, UPDATE transaction). These is one problem, however. Triggers don't have a specified execution order. Execution of triggers are performed randomly....Execution Order of Triggers In SQL.

Can a trigger execute a stored procedure?

MySQL allows you to call a stored procedure from a trigger by using the CALL statement. By doing this, you can reuse the same stored procedure in several triggers. However, the trigger cannot call a stored procedure that has OUT or INOUT parameters or a stored procedure that uses dynamic SQL.

What is an example of a trigger?

Trigger is defined as to fire a gun or to start a series of events or emotions. An example of trigger is to shoot a rifle while hunting. An example of trigger is to start crying at a movie, thereby causing many other people in the theater to begin weeping.

What are the types of trigger?

Types of Triggers in Oracle

• DML Trigger: It fires when the DML event is specified (INSERT/UPDATE/DELETE)
• DDL Trigger: It fires when the DDL event is specified (CREATE/ALTER)
• DATABASE Trigger: It fires when the database event is specified (LOGON/LOGOFF/STARTUP/SHUTDOWN)