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debugsqlMinor

Why "select" works in MariaDB but doesn't work in MySQL

Submitted by: @import:stackexchange-dba··
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whybutworksdoesnmysqlworkselectmariadb

Problem

set @row_number = 0;
SELECT 
    *
FROM
    (SELECT 
        (@row_number:=@row_number + 1) AS num,
        id,
        tbl_user_id,
        title,
        description,
        length lengths,
        create_date,
        file_size,
        thumbnails,
        videos.itsOK,
        viewed
    FROM
        tbl_videos videos
    WHERE
        videos.tbl_user_id = 23
            AND videos.tbl_category_id = 265
        ORDER BY videos.create_date DESC
) AS paginateTbl
WHERE
    paginateTbl.num > 0
        && paginateTbl.num <= 9


mysql results:

mariadb results:

Inner query work on both of them but main query work only in mariadb! What's the matter in mysql not working?

Versions used are mysql: 5.5.44-0ubuntu0.14.04.1 and mariadb 10.0.13-MariaDB-log.

The CREATE TABLE statements are identical (except for the AUTO_INCREMENT, number of rows):

MySQL result:

``
SHOW CREATE TABLE tbl_videos;

CREATE TABLE
tbl_videos (
id INT (20) NOT NULL AUTO_INCREMENT
,
title VARCHAR(255) COLLATE utf8_persian_ci NOT NULL
,
description TEXT COLLATE utf8_persian_ci NOT NULL
,
tags TEXT COLLATE utf8_persian_ci NOT NULL
,
video_quality VARCHAR(255) COLLATE utf8_persian_ci NOT NULL
,
dl_link1 VARCHAR(255) COLLATE utf8_persian_ci NOT NULL
,
dl_link2 VARCHAR(255) COLLATE utf8_persian_ci NOT NULL
,
dl_link3 VARCHAR(255) COLLATE utf8_persian_ci NOT NULL
,
viewed INT (11) NOT NULL
,
viewed_duration VARCHAR(255) COLLATE utf8_persian_ci NOT NULL
,
viewed_traffic VARCHAR(255) COLLATE utf8_persian_ci NOT NULL
,
embed_code VARCHAR(255) COLLATE utf8_persian_ci NOT NULL
,
sharing_code VARCHAR(255) COLLATE utf8_persian_ci NOT NULL
,
replace_times INT (11) NOT NULL
,
actual_link TEXT COLLATE utf8_persian_ci NOT NULL
,
tbl_user_id INT (11) NOT NULL
,
tbl_category_id INT (11) NOT NULL
,
tbl_player_id INT (11) NOT NULL
,
itsOK TINYINT (2) NOT NULL
,
length INT (20) NOT NULL
,
create_

Solution

It's MySQL 5.5 bug which reported to MySQL. so I installed mysql 5.6 and main query works well. same query with @@version in results.

set @row_number = 0;
SELECT 
    *, @@version mysql_version
FROM
    (SELECT 
        (@row_number:=@row_number + 1) AS num,
        id,
        tbl_user_id,
        title,
        description,
        length lengths,
        create_date,
        file_size,
        thumbnails,
        videos.itsOK,
        viewed
    FROM
        tbl_videos videos
    WHERE
        videos.tbl_user_id = 9
            AND videos.tbl_category_id = 113
            AND length > 0
        ORDER BY videos.create_date ASC
) AS paginateTbl
WHERE
    paginateTbl.num > 0
        && paginateTbl.num <= 9


mysql 5.5 & mysql 5.6 main query results:

Now I check a special id eg: 1103 in tbl_videos and both select works well.

SELECT 
    id,
    tbl_user_id,
    title,
    description,
    length lengths,
    create_date,
    file_size,
    thumbnails,
    itsOK,
    viewed,
    @@version mysql_version
FROM
    tbl_videos
WHERE
    id = 1103


mysql 5.5 & mysql 5.6 results:

Code Snippets

set @row_number = 0;
SELECT 
    *, @@version mysql_version
FROM
    (SELECT 
        (@row_number:=@row_number + 1) AS num,
        id,
        tbl_user_id,
        title,
        description,
        length lengths,
        create_date,
        file_size,
        thumbnails,
        videos.itsOK,
        viewed
    FROM
        tbl_videos videos
    WHERE
        videos.tbl_user_id = 9
            AND videos.tbl_category_id = 113
            AND length > 0
        ORDER BY videos.create_date ASC
) AS paginateTbl
WHERE
    paginateTbl.num > 0
        && paginateTbl.num <= 9
SELECT 
    id,
    tbl_user_id,
    title,
    description,
    length lengths,
    create_date,
    file_size,
    thumbnails,
    itsOK,
    viewed,
    @@version mysql_version
FROM
    tbl_videos
WHERE
    id = 1103

Context

StackExchange Database Administrators Q#114256, answer score: 4

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