inner-join

问题 So I have searched everywhere for this but I can't find this specific relation. The query below returns all posts from a user and the number of people who liked the post because I used a GROUP BY postid meaning that if the result repeat themselves but have the same postid then they are grouped. SELECT posts.id postid,posts.post_body,posts.post_type, ALLUSERS.USERNAME, likes.liker,likes.target, plikers.*, COUNT(posts.id) numberOflikes FROM posts INNER JOIN ALLUSERS ON(ALLUSERS.USERID=posts

问题 I have two MySQL tables. This is first one [products] (PRIMARY = id): [id] | title | description and this is the second [sizes] (PRIMARY = id & size): [id] | [size] size can only have values from [1,2,3,4,5,6] . I have a PHP array which has the size values. I reshape it to a comma-separated values string like this: $size_list = implode(",", $sizes); For those who are not familiar with PHP, the above code will generate an string like this: "1,4,5" and then query the database like this: $query

问题 Yesterday I posted a question on which said sum of columns of a table. See here! However, I got into some other complications. I have a second table that needs to have a column added in correspondence with the first. Here's what I need: The column 'sum2' is new and I am not able to sum it correctly! 回答1: I'm not sure where the issue is, without seeing your code. I built a small sample in SQLFIddle: SQLFiddle It's giving me the same result as you have in your post: IDPARENT COLUMN_1 COLUMN_2 1

问题 I am very new to Teradata and SQL in general. I need to create a table by combining data from three tables. I was able to successfully join two of them. I am not able to write the joining condition for the third table properly. Here is the code: select s.cola, s.colb, t.colc, t.cold, u.cole, u.colf, u.colg, u.colh, u.coli, u.colj, u.colk, u.coll from table1 s inner join table2 t on s.colb = t.colc inner join table3 u on t.cold = cast(u.colm as decimal) order by 3 where substr(cast(s.cola as

问题 I have 2 tables : albums (idalbum, idauthor, idcompositor, idfeat) people (id, firstname, last name) My Query SELECT * FROM albums a INNER JOIN people p ON a.idauthor = p.id INNER JOIN people p1 ON a.idcompositor = p1.id INNER JOIN people p2 ON a.idfeat = p2.id where a.idalbum=:id What i want : Album, p[First Name, Last Name], p1[First Name, Last Name], p2[First Name, Last Name] My problem : When i print_r the Query i just have one first name and one last name, the "p2" values. Thanks you in

问题 I have a pretty huge SQL query to check for notifications, and I have several different types of notifications in the table, IE: posts, likes, comments, photoComments, photoLikes, videoLikes, etc. (Always adding more to it) And I have come into a problem, I'm not really sure how to best do this anymore. Thus far the way I have done it is working perfectly, and really quite easy to add to, however this one notification Type I have to check more than just one other table, I have to check two

问题 I have this table: idSection | idQuestion | title | enunciation | idScale 1 | 1 | title 1 | question 1 | 3 1 | 1 | title 1 | question 1 | 3 1 | 1 | title 1 | question 1 | 3 1 | 1 | title 1 | question 1 | 2 1 | 1 | title 1 | question 1 | 5 1 | 2 | title 2 | question 2 | 1 1 | 2 | title 2 | question 2 | 3 1 | 3 | title 3 | question 3 | 1 And have this table: idScale | name 1 | Very Bad 2 | Bad 3 | Good 4 | Very Good 5 | Excellent I wanted a table like this: idSection | idQuestion | title |

问题 Q1: How do I get a count of NICs for each virtual machine? e.g. virtualMachine1 2 virtualMachine2 3 virtualMachine3 1 virtualMachine4 2 Q2: How do I get the value that represents the max number of NICs for any virtual machine? e.g. 10 The following query returns all virtual machine-nic pairs: SELECT VirtualMachine.VirtualMachineName, VMToNetwork.MacAddress FROM VirtualMachine INNER JOIN VMToNetwork ON VirtualMachine.VirtualMachineID = VMToNetwork.VirtualMachineID ORDER BY VirtualMachine

问题 Here is a sample of my DATA: CLIENT_ATTRIBUT : ID_CLIENT | DATE_CLIENT | ATTRIBUT ----------+-------------+--------- 000000001 | 2010:03:01 | 0000010 ----------+-------------+--------- 000000001 | 2010:02:16 | 0000010 ----------+-------------+--------- 000000001 | 2010:03:04 | 0000011 ----------+-------------+--------- 000000002 | 2010:03:01 | 0001000 ----------+-------------+--------- CLIENT : ID_CLIENT | NOM_MARITAL | ----------+-------------+ 000000001 | PANTROMANI | ----------+-----------

问题 I have a User and Company entity. Each User belongs to a Company . Here are my entities (shortened): <?php namespace App\Model\Entity; use Doctrine\ORM\Mapping as ORM; use Doctrine\Common\Collections\ArrayCollection; /** * @ORM\Table(name="user") */ class User { /** * @ORM\Id * @ORM\Column(type="integer", name="user_id") * @ORM\GeneratedValue(strategy="AUTO") */ private $id; /** * @ORM\Column(length=200) */ private $email; /** * @ORM\ManyToOne(targetEntity="Company", inversedBy="users", fetch