Can we use FOR loop in cursor?
Description. You would use a CURSOR FOR LOOP when you want to fetch and process every record in a cursor. The CURSOR FOR LOOP will terminate when all of the records in the cursor have been fetched.
What is difference between loop and cursor?
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.
What is a loop Oracle?
LOOP statements execute a sequence of statements multiple times. The LOOP and END LOOP keywords enclose the statements. PL/SQL provides four kinds of loop statements: basic loop, WHILE loop, FOR loop, and cursor FOR loop.
How do I run a loop in Oracle SQL Developer?
Syntax
- The initial step is executed first, and only once. This step allows you to declare and initialize any loop control variables.
- Next, the condition, i.e., initial_value ..
- After the body of the for loop executes, the value of the counter variable is increased or decreased.
- The condition is now evaluated again.
What is difference between simple loop while loop & FOR loop?
Only initialization and condition checking is done at the top of the loop. The ‘for’ loop used only when we already knew the number of iterations. The ‘while’ loop used only when the number of iteration are not exactly known. If the condition is not put up in ‘for’ loop, then loop iterates infinite times.
How do you SELECT a loop in SQL query?
SQL While loop syntax The while loop in SQL begins with the WHILE keyword followed by the condition which returns a Boolean value i.e. True or False. The body of the while loop keeps executing unless the condition returns false. The body of a while loop in SQL starts with a BEGIN block and ends with an END block.
Which is better while loop or cursor?
Always confusing thing is which one is better; SQL While loop or cursor? While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets.
What is difference between for loop and cursor in Oracle?
Originally Answered: what is the difference between for loop and cursor for loop in Oracle? Cursor holds the select query and on the basis of that query it can define a loop. In simple for loop we will just use a single variable.
Can we use loop in Oracle?
In Oracle, the FOR LOOP allows you to execute code repeatedly for a fixed number of times.
Can we use loop in SQL query?
In SQL Server, there is no FOR LOOP. However, you simulate the FOR LOOP using the WHILE LOOP.
Why for loop is better than while?
In general, you should use a for loop when you know how many times the loop should run. If you want the loop to break based on a condition other than the number of times it runs, you should use a while loop.