选择计数为零的行

Question

The table have 11 rows

Query

SELECT COUNT(*) FROM `zars_all` ORDER BY id DESC LIMIT 9,9

Result

Zero Rows, even there are two rows having id 10 and 11

Query

SELECT * FROM `zars_all` ORDER BY id DESC LIMIT 9,9

Result

Two Rows having id 10 and 11

I have tried using column names as value in Count but it does't help. Any help is appreciated and please tell me if I am doing anything wrong here.

Answer 1

Your first sentence SELECT COUNT(*) returns an integer.

That means that the trailing LIMIT 9,9 is setting a minimum of 9 elements and a maximum of 9 elements.

Let's examine the LIMIT offset, count clause parameters:

The offset specifies the offset of the first row to return.
The count specifies the maximum number of rows to return.

Your offset is out of bounds, that is why you get no rows .

Please remove that and leave it like:

SELECT COUNT(*) FROM `zars_all` ORDER BY id DESC

Answer 2

Waqas,
LIMIT cannot be applied directly along with COUNT instead change your query like

SELECT count(*) FROM (select * from zars_all limit 9,9) as a"**;