I have two table (table 1 and table 2) . I want to show all the rows from table1 by joining with table2 which have multiple rows with same table1 id (foreign key relation) and will sort the result by table2 priority column (order by desc).
Table1
Table2
Result will be
thanks in advance
Edit
Table1
id name
1 test1
2 test2
3 test5
4 test7
5 test9
6 test3
Table2
id table1_id event priority
1 2 abc 0
2 2 kbc 0
3 2 abc 2
4 2 kbc 1
5 4 fgg 2
6 4 dss 3
7 1 fgfg 2
8 5 fgfg 2
9 6 xcxc 1
10 6 fgfh 3
Result
id_table1 name event priority
4 test7 dss 3
6 test3 fgfh 3
2 test2 abc 2
1 test1 fgfg 2
5 test9 fgfg 2
3 test5 NULL NULL
In the question you mentioned you need to select the data where id from table1 is available more than once in the table2 which does not match with the result set you gave.
Considering the original requirement the following should do the trick
select
t2.table1_id as id_table1,
t1.name,
t2.priority,
t2.event
from table1 t1
join
(
select
p1.table1_id,
p1.event,
p2.priority
from table2 p1
join(
select
max(priority) as priority,
table1_id
from table2
group by table1_id having count(*) > 1
)p2
on p2.table1_id = p1.table1_id and p2.priority = p1.priority
)t2
on t1.id = t2.t1id
order by t2.priority desc
Here is a demo
The result will get the same event corresponding the max priority column
This will get the result set that you want. You mentioned that you only need the items table1 ids that reflects more than once but result query shows tableid1 "1" even though it is only present once:
SELECT DISTINCT t1.id,t1.name ,t2.event, t2.priority
FROM TABLE2 t2
right join
TABLE1 t1
on t1.id=t2.table1_id
order by t2.priority desc
Try this query:
SELECT t1.*,t2.priority FROM table1 t1
INNER JOIN table2 t2
ON t1.id=t2.id
ORDER BY t2.priority DESC
Primary key and foreign key should have the same name. The syntax should be
SELECT Table1.id_table1,Table1.name,Table2.event,Table.priority FROM
Table1 LEFT JOIN Table2 ON
Table1.id=Table2.id
ORDER BY Table2.priority DESC
Make the following changes in Table2:
Get rid of the first column or rename it
Rename second column(your foreign key) to "id".
Related
I've a table syntax like this,
- table1
id foreign_table_id
-----------------------
1 2
2 2
3 2
4 1
5 1
6 1
The other table is,
- table2
id value
------------
1 20
2 10
I want to get a summation of table1.foreign_table_id where the data will retrieve from table2.
Like this example should produce the result 90
Please provide any solution.
Use below query.
Select sum(table2.value) as total FROM table1 LEFT JOIN table2 ON table1.foreign_table_id = table2.id
It will give u below result.
Output::
total
-----
90
SELECT SUM(table2.value) AS summation FROM table1 LEFT JOIN table2
ON table2.id = table1.foreign_table_id
i am unable to get team id and user_type every time getting two columns only
SELECT `dev_user`.first_name,`dev_user`.user_id FROM `dev_test_teams_athlete` LEFT JOIN dev_user ON dev_test_teams_athlete.user_id = dev_user.user_id UNION ALL SELECT `dev_user`.first_name, `dev_test_team`.user_id as coach_id FROM `dev_user` RIGHT JOIN dev_test_team ON dev_test_team.user_id = dev_user.user_id UNION ALL SELECT dev_test_team.team_id,dev_test_teams_athlete.user_id as athlete FROM `dev_test_team` LEFT JOIN `dev_test_teams_athlete` ON `dev_test_team`.`team_id` = `dev_test_teams_athlete`.`team_id`
this is result when using union all keyword with query
i am getting result like that which is unwanted result
my dev_test_team table is
my dev_test_teams_athlete table is
my dev_user table is
finally i want result like that as describe in the image
1st i want answer like that
-------------------------------------------
user_id | first_name | user_type | team_id
-------------------------------------------
480 coach1 3 1
472 coach2 3 2
465 coach3 3 3
380 athlete1 4 1
375 athlete2 4 2
479 athlete3 4 3
464 athlete4 4 3
SELECT
`x`.`team_id`, `du`.`first_name`, `du`.`user_type`, `x`.`team_id`
FROM(
SELECT `team_id`, `user_id` FROM `dev_test_team`
UNION ALL
SELECT `team_id`, `user_id` FROM `dev_test_teams_athlete`
) `x`
LEFT JOIN `dev_user` `du` ON `du`.`user_id` = `x`.`user_id`
============================================================
Try it.
I need a help with projecting my database. The purpose of this database will be to show offers in different categories. There are 1-6 categories to each item. There are around 80 categories types, so I decided to make three tables as below:
table1:
ID Item_id
1 1
2 2
3 3
4 4
5 5
table2:
ID Item_id Category
1 1 cat55
2 1 cat56
3 1 cat57
4 1 cat58
5 2 cat42
6 2 cat43
7 2 cat44
8 2 cat45
9 3 cat42
etc.
table3:
Category_id category_name
cat55 apples
cat56 oranges
cat57 bananas
cat58 pineapples
Am I doing this right? I've got a problem to make proper sql query to show my categories in php, because when I use this query:
SELECT table1.*, table2.*, table3.*
FROM table1
INNER JOIN table2
ON table1.item_id = table2.item_id
INNER JOIN table3
ON table2.category=table3.category_id
It only gives me the first category name, when I need all of them and show them like this:
Item 1: apples, oranges, bananas, pineapples
Item 2: cat42, cat43, cat44, cat45
Item 3: cat42
What am I doing wrong? Is it wrong query or I need to change the database structure to like this
table 1 and 3 unchanged
table 2:
ID Item_id c1 c2 c3 c4 c5 c6
1 1 cat55 cat56 cat57 cat58 null null
2 2 cat42 cat43 cat44 cat45 null null
3 3 cat42 null null null null null
I'm using foreach loop, so I can do only one query, I know that more queries are possible, but I need to make it as simple as possible.
If you want to fetch all names in single row for each item, following query will work:
SELECT table1.Item_Id,Group_Concat(t3.category_name separator ',') as Category_Name
FROM table1
INNER JOIN table2
ON table1.item_id = table2.item_id
INNER JOIN table3
ON table2.category=table3.category_id
Group by table1.Item_Id;
I don't find any problem in your DB Structure.
Hope it helps!
In my table 1 I have something like this
name | age
George 42
Bob 30
Ken 23
In my table 2, I have something like this, this is where i store votes for each person.
name | votes |
George 1
Ken 1
George 1
George 1
Ken 1
My goal is to combine the 2 tables, and return all the rows in table 1 even it doesn't exist in table 2.
Desire results:
name | age | total_votes
George 42 3
Bob 30 0
Ken 23 2
But instead I get:
name | age | total_votes
George 42 3
Ken 23 2
I have tried something like this
SELECT `table_1`.*, coalesce(COUNT(`table_2`.votes), 0) AS total_votes
FROM `table_1`
LEFT JOIN `table_2`
ON `table_1`.name = `table_2`.name
You can do one of these:
1) Use Right Join instead of current Left Join.
Or
2) Exchange table1 and table2 places in your join expression, like:
FROM table_2
LEFT JOIN table_1
Try this. This works in MS Access , I think this will work on your's too just convert the query to SQL:
SELECT Table1.name, First(Table1.age) AS age, Count(Table2.Votes) AS totalVotes
FROM Table1 LEFT JOIN Table2 ON Table1.name = Table2.name
GROUP BY Table1.name;
Left Join table1 to table2 so that all entry from table1 , even if its is corresponding data is null, will be included. GROUP BY your query by name so that votes will be counted by name .
This question already has an answer here:
Select all rows that have at least a list of features
(1 answer)
Closed 9 years ago.
I have a mysql table
Table A
--------------------
item_id category_id
--------------------
1 1
1 2
1 4
2 1
2 3
Would like to make an sql query that will select all matches in an array
example:
given category_ids are 1,4 it should return only item_id 1
given category_ids are 1 it should return item_id 1 and 2
Thanks
For categories 1, 4:
SELECT item_id, COUNT(*) c
FROM TableA
WHERE category_id IN (1, 4)
GROUP BY item_id
HAVING c = 2
For category 1:
SELECT item_id, COUNT(*) c
FROM TableA
WHERE category_id IN (1)
GROUP BY item_id
HAVING c = 1
I think you should be able to see the pattern -- the HAVING clause should match the number of categories.
This assumes that item_id, category_id is unique in the table.
given category_ids are 1,4
SELECT item_id, category_id
FROM TableA
WHERE category_id IN (1, 4)
given category_ids are 1
SELECT item_id, category_id
FROM TableA
WHERE category_id IN (1)