Databases
StackOverflow2013
Postsdbo
POhow to get vistors_sum and reviews_count in 3 table?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POhow to get vistors_sum and reviews_count in 3 table?
    primarykey
    data
    text
    <p>how to get vistors_sum and reviews_count in 3 table ? see the bellow codes, how to get my result in one sql?</p> <pre><code>SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for `a` -- ---------------------------- DROP TABLE IF EXISTS `a`; CREATE TABLE `a` ( `products_id` int(11) NOT NULL, `products_name` varchar(255) default NULL, PRIMARY KEY (`products_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of a -- ---------------------------- INSERT INTO `a` VALUES ('1', 'jimmy'); INSERT INTO `a` VALUES ('2', 'tina'); INSERT INTO `a` VALUES ('3', 'emma'); SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for `b` -- ---------------------------- DROP TABLE IF EXISTS `b`; CREATE TABLE `b` ( `id` int(11) NOT NULL auto_increment, `products_id` int(11) NOT NULL, `vistors` int(11) NOT NULL, `date` date default NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO_INCREMENT=5 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of b -- ---------------------------- INSERT INTO `b` VALUES ('1', '1', '1', '2013-11-13'); INSERT INTO `b` VALUES ('2', '1', '2', '2013-11-04'); INSERT INTO `b` VALUES ('3', '2', '1', '2013-11-13'); INSERT INTO `b` VALUES ('4', '2', '3', '2013-11-13'); SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for `c` -- ---------------------------- DROP TABLE IF EXISTS `c`; CREATE TABLE `c` ( `id` int(11) NOT NULL auto_increment, `products_id` int(11) NOT NULL, `review_content` varchar(255) default NULL, `date` date default NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO_INCREMENT=5 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of c -- ---------------------------- INSERT INTO `c` VALUES ('1', '1', 'hello', '2013-11-13'); INSERT INTO `c` VALUES ('2', '1', 'world', '2013-11-13'); INSERT INTO `c` VALUES ('3', '2', 'good', '2013-11-12'); INSERT INTO `c` VALUES ('4', '3', 'boy', '2013-11-13'); </code></pre> <p><img src="https://i.stack.imgur.com/apxRn.png" alt="enter image description here"></p> <p>this code bellow can do but the date condition is in sub children temp table. this make the sql not flexible (if I want to query any time not 2013-11-13)</p> <pre><code>select a.products_id, a.products_name, b.vistors_sum, c.reviews_count from a left join ( select b.products_id, b.date, sum(b.vistors) as vistors_sum from b where b.date = '2013-11-13' group by b.products_id ) as b on a.products_id = b.products_id left join ( select c.products_id, count(c.products_id) as reviews_count from c where c.date = '2013-11-13' group by c.products_id ) as c on a.products_id = c.products_id </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USmingfish_004
    1. USmingfish_004
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COa, b, and c are not useful names for tables. They are however useful aliases for distinct 'instances' of tables.
      singulars
      1. POhow to get vistors_sum and reviews_count in 3 table?
      1. USStrawberry
    2. COAlso, I don't understand why table `b` would have two identical `products_id`s for the same date!?!?
      singulars
      1. POhow to get vistors_sum and reviews_count in 3 table?
      1. USStrawberry
    3. COthe date should be date time, my table is not so strict
      singulars
      1. POhow to get vistors_sum and reviews_count in 3 table?
      1. USmingfish_004
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload