pls explain
Hi Master,
Select the level from dual connect by level > 1; -> it displays up to infinity. (ORA-30009: not enough memory to CONNECT BY operation) it will finally come.
But when I run like that...
Select double connection of level 2 > or Select the double connection by level > 3; It will only give 1 answer. Please explain me.
Concerning
AR
Hello
874273 wrote:
Hi Master,
Select the level from dual connect by level > 1; -> it displays up to infinity. (ORA-30009: not enough memory to CONNECT BY operation) it will finally come.
But when I run like that...
Select the level from dual connect by level > 2 or select the level of the double log level > 3; It will only give 1 answer. Please explain to me.
Concerning
AR
Any line that meets the condtion START WITH (or each row of the table, if there no START WITH clause) is at LEVEL 1.
For the LEVEL N (N > 1), Oracle evaluates the CONNECT BY clause. If the CONNECTION WITH the condition is true for a given line, this line is included in the game with the LEVEL of results = N.
The request ends when the CONNECT BY condition is not true for any row.
Let's see how this applies to your queries.
There is no START WITH clause in a query, so that each line of the table double (there is only 1) will be LEVEL = 1.
What will be the level = 2 lines? In the case of
CONNECT BY LEVEL > 1
every row satisfies this condition, because 2 > 1. Because something has been added for LEVEL = 2, the query continues with LEVEL = 3. What will be the level = 3 lines? Once again, all the lines, because condition 3 > 1 is true for all lines. It can even to levels 4, 5, 6,... to infinity.
In the case of
CONNECT BY LEVEL > 2
No line fill the CONNECT BY condition, because 2 is not greater than 2. Since no lines are added to LEVEL = 2, the ends of the query.
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