Need to understand the features of LEVEL when printing from 1 to 100

Can someone please explain to me how the following query?

SELECT LEVEL just_a_column

OF the double

CONNECT BY LEVEL < = 365

I tried to understand Oracle generator line Techniques - Oracle FAQ , but I did not understand much.

Hello

ORA - aff wrote:

Thanks Frank. I appreciate your response.

Can you please explain more about how "CONNECT LEVEL <=> works in this query?"

I understand when it is "CONNECT BY PRIOR emp_id = mgr_id" - for a current line it's going to go and find a row in the table employees whose Manager id is equal to the employee id for the previous line.

Good!  You already understand the most difficult part.

In this case, CONNECT BY condition is

Emp_id PRIOR = mgr_id

This condition uses emp_id PREREQUISITE, which means that, when deciding if a line will join the game at the level of results = n, he's looking to see what the emp_ids are on LEVEL =(n-1).

A line will join the LEVEL = 2 if its mgr_id is identical to a level 1 = emp_id.

A line will join the LEVEL = 3 if its mgr_id is identical to a level 2 = emp_id

A line will join the LEVEL = 4 if its mgr_id is identical to a level 3 = emp_id.

...

and so on, until you reach a LEVEL where no line do not join.

But I don't understand "CONNECT LEVEL <=> ?"

In this case, CONNECT BY condition is just

LEVEL<=>

PRIOR is not used in this condition, which means that, when deciding if a line will join the game at the level of results = n, it is not all knowledge on what is on LEVEL =(n-1).

A line will join the LEVEL = 2 if 2<=>

A line will join the LEVEL = 3 if 3<=>

A line will join the LEVEL = 4 If 4<=>

...

and so on, until you reach a LEVEL where no line do not join (which will be LEVEL = 366).

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