That could leave gaps in the index, but the built-in function NEXT allows you to iterate over any series of clues.

Hello

can you please explain the below topic?

That could leave gaps in the index, but the built-in function NEXT allows you to iterate over any series of clues. -> this line

  1. Arrays have a fixed upper bound, but the nested tables are unlimited (see Figure 5-1). Thus, the size of a nested table can increase dynamically.

Table in figure 5-1 against the nested Table

Text description of pls81016_array_versus_nested_table.gif follows
Description of the illustration pls81016_array_versus_nested_table.gif

  • Tables should be dense (have consecutive indices). So, you can delete individual items from a table. Initially, the nested tables are dense, but they can become sparse (have non-consecutive indexes). So, you can remove items from a table nested by using the integrated procedure DELETE . That could leave gaps in the index, but the built-in function NEXT allows you to iterate over any series of indexes.

Hello

Look at the second half of the Figure 5-1, the 'Nested Table after destruction".  X (9), x.5 and x (2) elements have been removed, so the index values are 1, 3, 4, 6, 7, 8 and 10.  There is a gap between 1 and 3, another gap between 4 and 6 and another gap between 8 and 10.

You could not use a simple FOR loop:

FOR j IN 1... 10

LOOP

...

END LOOP;

to iterate over a collection of rare as this, but you can use a loop where you get with the FOLLOWING indices:

j: = x.FIRST;

Then j IS NOT NULL

LOOP

...

j: = (j) x.NEXT;

END LOOP;

Tags: Database

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