How Oracle 'row_limiting_clause' for the number of lines. percent for HUNDRED lines works in Oracle 12 c?

Platform: Windows 7 x 64 database: Oracle Database Enterprise Edition Release 12.1.0.2.0 12 c - 64 bit.

How row_limiting_clause Oracle to rowcount. percent for HUNDRED lines works in Oracle 12 c?

Row_limiting_clause Oracle is acting funny. In the code below, the 'fetch_test' table has 10 rows

Case 1 When using row_limiting_clause with first extract 0.5 lines only I get, no line selected

Case 2 When use the row_limiting_clause with the first rows only 5 percent clause I get,1 row as output.

This means case 1! = 2 cases [0.5! = 0.5 (5 percent of 10 lines)]

SQL > select * from fetch_test;

COL1 COL2

---- ----

1A

2B

3 C

4 D

5 E

6 F

8: 00

5%

: j

10 J

10 selected lines.

case 1:

SQL > select col1 from fetch_test

2 first extract 0.5 lines only;

no selected line

case 2:

SQL > select col1 from fetch_test

2 extract the first rows of 5 percent;

COL1

----

1

1 selected line

What Oracle Documentation has to say,

https://docs.Oracle.com/database/121/SQLRF/statements_10002.htm

If the number of lines has a fraction, then the fractional part is truncated. If the number of rows is NULL, 0 rows are then returned.

This explains the case 1, but I can't find any possible explanation in case 2 in my example above. and there is no mention on percentage clause in the Oracle Documentation.

Already asked on stack - overflow.but I got the answer regarding "assumes percent Gets the cycle of 5% to 10%.

No idea why Oracle doing what they do on the documentation!  I hope that now you have the answer: a rest (when you use percent in the line limiter) will ALWAYS return a number integer, rounded upward.

Tags: Business Intelligence

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