I have two table .
first table
f_id | date |
--------------
1 |2012-1-01
1 |2012-1-02
second table
s_id | f_id | name
-------------------
1 | 1 |rakib
2 | 1 | shohug
i want to view this data
like
f_id| date | s_id | name
--------------------------
1 |2012-1-01 | 1 | rakib
1 |2012-1-01 | 2 | shohug
1 |2012-1-02 | 1 | rakib
1 |2012-1-02 | 2 | shohug
plz help me how to write it in mysql query
select f.f_id, f.`date`, s.s_id, s.`name`
from firsttable f
join secondtable s on f.f_id=s.f_id
order by f.f_id, f.`date`, s.s_id
Do you just mean
SELECT first.f_id, first.date, second.s_id, second.name
FROM first JOIN second ON second.f_id = first.f_id
?
(See http://en.wikipedia.org/wiki/Join_(SQL).)
Seems you want to do FULL OUTER join it includes all rows from both tables. Mysql does't support it directly.
But you can try below:
select * from firsttable as a
left outer join secondtable as o on a.f_id = o.f_id
union all
select * from firsttable as a
right outer join secondtable as o on a.f_id = o.f_id
Also go through this article will help you http://www.xaprb.com/blog/2006/05/26/how-to-write-full-outer-join-in-mysql/
Related
I want to ask ..
If i have data but data related in another table
but i want the output is display all data
usually if data related in another table, I using INNER JOIN but the output just data have a relation, if dont have relation, its not display .. IF I using LEFT JOIN or RIGHT JOIN not all data displayed .. IF I using UNION data duplicated
this just example field .. field in real so many
TABLE A
ID | NAMA |
----------------------
1 | Rina |
2 | Deni |
3 | Muti |
4 | Sina |
5 | Sasa |
TABLE B
ID | Rumah |
----------------------
1 | Jabar |
2 | Jateng |
3 | Jatim |
OUTPUT THAT I WANT
ID | NAMA | Rumah
----------------------------------
1 | Rina | Jabar
2 | Deni | Jateng
3 | Muti | Jatim
4 | Sina | -
5 | Sasa | -
short version:
SELECT COALESCE(a.ID, t2.ID),
COALESCE(a.NAMA, '-')
COALESCE(b.Rumah, '-')
FROM TableA a
LEFT JOIN TableB b
ON a.ID = b.ID
RIGHT JOIN TableB t2
ON a.ID = b.ID
If I understand your problem correctly, then a given ID might only have a first or last name, but not both. In this case, simply doing a left or right join will result in the loss of data. One approach here is to do a full outer join between your two tables on the ID, and then use COALESCE to handle possibly missing data appropriately.
SELECT COALESCE(t1.ID, t2.ID) AS ID,
COALESCE(t1.NAMA, '-') AS NAMA,
COALESCE(t2.Rumah, '-') AS Rumah
FROM TableA t1
LEFT JOIN TableB t2
ON t1.ID = t2.ID
UNION
SELECT COALESCE(t1.ID, t2.ID),
COALESCE(t1.NAMA, '-')
COALESCE(t2.Rumah, '-')
FROM TableA t1
RIGHT JOIN TableB t2
ON t1.ID = t2.ID
I have the following tables:
'blog_content'
'blog_media'
'blog_media_content'
| blog_id | media_id |
========================
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 3 | 4 |
I want to select all blog_media.uri's where blog_media.media_id equals blog_media_content.blog_id.
Please help me to achieve my aim.
An inner join between blog_media and blog_media_content tables would suffice.
SELECT
bm.uri
FROM blog_media bm
INNER JOIN blog_media_content bmc ON bm.media_id = bmc.media_id
WHERE bmc.blog_id =3;
Note:
If you need any additional information from blog table then you need an additional inner join like below:
...INNER JOIN blog_table b ON bmc.blog_id = b.blog_id...
EDIT:
In order to get records for all blog_ids :
SELECT
bm.uri
FROM blog_media bm
INNER JOIN blog_media_content bmc ON bm.media_id = bmc.media_id
ORDER BY bmc.blog_id;
Let's say i've got this database:
book
| idBook | name |
|--------|----------|
| 1 |Book#1 |
category
| idCateg| category |
|--------|----------|
| 1 |Adventures|
| 2 |Science F.|
book_categ
| id | idBook | idCateg | DATA |
|--------|--------|----------|--------|
| 1 | 1 | 1 | (null) |
| 2 | 1 | 2 | (null) |
I'm trying to select only the books which are in category 1 AND category 2
This is what I've got so far:
SELECT book.* FROM book,book_categ
WHERE book_categ.idCateg = 1 AND book_categ.idCateg = 2
Obviously, this giving 0 results becouse each row has only one idCateg it does work width OR but the results are not what I need. I've also tried to use a join, but I just can't get the results I expect.
Here it's the SQLFiddle of my current project, the data at the begining is just a sample.
SQLFiddle
Any help will be really appreciated.
You could double join with a constraint on the category id:
SELECT a.* FROM book AS a
INNER JOIN book_categ AS b ON a.idBook = b.idBook AND b.idCateg = 1
INNER JOIN book_categ AS c ON a.idBook = c.idBook AND c.idCateg = 2
You could use a subquery:
SELECT a.* FROM book AS a
WHERE
(SELECT COUNT(DISTINCT idCateg) FROM book_categ AS b
WHERE b.idBook = a.idBook AND b.idCateg IN (1,2)) = 2
If you are on MySQL as your fiddle implies, you should prefer the join variant, since most joins are much faster in MySQL than subqueries.
edit
This one should also work:
SELECT a.* FROM book a
INNER JOIN book_categ AS b ON a.idBook = b.idCateg
WHERE b.idCateg IN (5, 6)
GROUP BY idBook
HAVING COUNT(DISTINCT b.idCateg) = 2
and should be faster than the two above, although you have to change the last number according to the number of category ids you are requesting.
I have a table
--------------------
ID | Name | RollNO
--------------------
1 | A | 18
--------------------
2 | B | 19RMK2
--------------------
3 | C | 20
--------------------
My second table is
-----------------------
OldRollNo | NewRollNo
-----------------------
18 | 18RMK1
-----------------------
19 | 19RMK2
-----------------------
20 | 20RMK3
-----------------------
21 | 21RMK4
-----------------------
22 | 22RMK5
-----------------------
I want the resulting table like
----------------------------------
ID | Name | RollNo | LatestRollNo
----------------------------------
1 | A | 18 | 18RMK1
----------------------------------
2 | B | 19RMK2 | 19RMK2
----------------------------------
3 | C | 20 | 20RMK3
----------------------------------
What would be the select query like? This is just the replica of my problem. I have used CASE Statement with the select query but as the records in my table is large, it's taking too much time. In my second table the OldRollNo Column is unique.One more thing is that in the resultant RollNo column if the newly assigned RollNo is already present then it should be copied exactly to the next column i.e LatestRollNo. I have to check only those RollNo which are old.
Thanks.
Try something like this:
select t1.ID
, t1.Name
, t1.RollNO
, LatestRollNO = coalesce(n.NewRollNo, o.NewRollNo)
from t1
left join t2 o on t1.RollNO = o.OldRollNo
left join t2 n on t1.RollNO = n.NewRollNo
SQL Fiddle with demo.
It sounds like your issue is performance not logic; something like this should hopefully allow approriate index usage assuming you have the appropriate indexes on t2.OldRollNo and t2.NewRollNo.
The problem with OR or CASE in a WHERE clause is that these don't always lend themselves to efficient queries; hopefully this will be a bit more useful in your case.
select f.ID, f.name, f.RollNo, s.NewRollNo as "Latest RollNo"
from FirstTable f
inner join
SecondTable s on f.RollNo = s.OldRollNo or f.RollNo = s.NewRollNo
select t.id,t.name,t.rollno,tt.newrollno as latestrollno from
talble1 t
left join
table2 tt on t.rollno = tt.oldrollno
You need to use inner join.
SELECT t1.ID,t1.Name,t2.RollNo,t2.NewRollNo AS LatestRollNo
FROM Table1 t1
INNER JOIN Table2 t2
ON t1.RollNo=t2.OldRollNo OR t1.RollNo=t2.NewRollNo
How to select 2 table with condition and show all data
store_profile
id + store_name
1 | Accessorize.me
2 | Active IT
3 | Edushop
4 | Gift2Kids
5 | Heavyarm
6 | Bamboo
store_fee
id + store_id + date_end
1 | 1 | 27-6-2013
2 | 2 | 29-8-2013
3 | 3 | 02-6-2013
4 | 4 | 20-4-2013
Below is my previous query
$query = "select sp.id, sp.store_name, sf.id, sf.store_id, sf.date_end from store_profile sp, store_fee sf where sf.store_id=sp.id"
and the result is something like this :
1 | Accessorize.me 27-6-2013
2 | Active IT 29-8-2013
3 | Edushop 02-6-2013
4 | Gift2Kids 20-4-2013
but what i want is show all store name including date_end but if no date_end still can show store name with empty date_end
You want to use an outer join. With an outer join, columns on the joining table do not need to match the conditional columns in the joined table to get results:
SELECT * FROM store_profile sp LEFT JOIN store_fee sf ON (sf.store_id = sp.id)
Use a left join:
select sp.id, sp.store_name, sf.id, sf.store_id, sf.date_end
from store_profile sp left join store_fee sf on sf.store_id=sp.id
The syntax you are using is interpreted as INNER JOIN, which means that stores without a corresponding entry in store_profile won't show up. You want to use LEFT JOIN:
SELECT sp.id, sp.store_name, sf.id, sf.store_id, sf.date_end
FROM store_profile sp
LEFT JOIN store_fee sf
ON sf.store_id=sp.id
LEFT JOIN means that all records in the first table will be returned, even if there's not a match in the second table.