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subtract "1" from the number in a row SQL Query [duplicate]
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Closed 8 years ago.
I am new in my sql and can not really figure out how to do it.
I have a two tables.
trucks
select * from trucks;
+----+---------+----------+--------+--------------+
| id | size | quantity | status | customers_id |
+----+---------+----------+--------+--------------+
| 12 | 10_feet | 3 | active | 0 |
| 13 | 10_feet | 3 | active | 0 |
| 14 | 10_feet | 2 | active | 0 |
| 15 | 14_feet | 5 | active | 0 |
| 16 | 14_feet | 2 | active | 0 |
| 17 | 14_feet | 2 | active | 0 |
| 18 | 17_feet | 2 | active | 0 |
| 19 | 17_feet | 2 | active | 0 |
| 20 | 24_feet | 3 | active | 0 |
| 21 | 10_feet | 1 | active | 0 |
| 22 | 24_feet | 1 | active | 0 |
+----+---------+----------+--------+--------------+
and truck_customers
select * from truck_customers;
+----+--------+----------+--------+------------------+---------+------------+
| id | first | last | dl | email | size | date_in |
+----+--------+----------+--------+------------------+---------+------------+
| 3 | Poul | Jons | A13324 | poul#gmail.com | 10_feet | 2013-11-30 |
| 4 | Poul | Watson | A23439 | watson#gmail.com | 10_feet | 2013-11-30 |
| 5 | Alex | Snders | A22 | Alex#gmail.com | 17_feet | 2013-11-30 |
| 6 | santes | Garsia | A18337 | Santes#gmail.com | 10_feet | 2013-11-30 |
| 7 | James | Bond | JB111 | Bond#gmail.com | 10_feet | 2013-11-30 |
| 8 | John | Travolta | G123 | Gohn#gmail.com | 14_feet | 2013-11-30 |
+----+--------+----------+--------+------------------+---------+------------+
When entering information into truck_customers, it should automatically subtract
one item from trucks table based on the size.
Using
$sql = " UPDATE trucks SET quantity = -- WHERE size = '$size'";
But it does not work.
I can send you my code if it is going to be easier to understand.
You're almost there.
UPDATE trucks SET quantity = quantity-1 WHERE size = '$size'
Fiddle
Not only would your code not work, but you'd lose your WHERE conditions too...
-- this is a comment in SQL
http://dev.mysql.com/doc/refman/5.0/en/comments.html
You need to assign to original variable plus/minus increment, as Hanky Panky mentioned above.
Related
I have a table, with the students of a class:
+----+-----------+----------+---------+
| id | nume | prenume | absente |
+----+-----------+----------+---------+
| 1 | Radu | Catalina | 0 |
| 2 | Maselusa | Andreea | 0 |
| 3 | Goaga | Ramona | 0 |
| 4 | Stoica | Teodor | 0 |
| 5 | Petrache | Adrian | 0 |
| 6 | Stoica | Dragos | 0 |
| 7 | Florea | Valeriu | 0 |
| 8 | Coleasa | Ionut | 0 |
| 9 | Panait | Andreea | 0 |
| 10 | Vasile | Codrut | 0 |
| 11 | Ungureanu | Costin | 0 |
| 12 | Pantazi | Daniel | 0 |
| 13 | Stroe | Stefan | 0 |
| 14 | Cojocaru | Iulian | 0 |
| 15 | Pirvu | David | 0 |
| 16 | Ion | Raluca | 0 |
| 17 | Olaru | Andreea | 0 |
+----+-----------+----------+---------+
with id, last name, first name and absence.
Then, I have another table:
+----+--------------+---------------+
| id | nume_materie | medie_actuala |
+----+--------------+---------------+
| 1 | Limba romana | 0 |
| 2 | Matematica | 0 |
| 3 | Fizica | 0 |
| 4 | Chimie | 0 |
| 5 | Biologie | 0 |
| 6 | Informatica | 0 |
| 7 | Engleza | 0 |
| 8 | Franceza | 0 |
| 9 | Geografie | 0 |
| 10 | Istorie | 0 |
| 11 | Sport | 0 |
| 12 | Economie | 0 |
| 13 | Psihologie | 0 |
+----+--------------+---------------+
With id, name of the class and actual average grade.
Now, I need to print one of those students with all classes and grades.
Example:
I want to print this in PHP:
Radu Catalina, 0 absences.
Grades:
1. Limba Romana: 8
2. Matematica: 9
3. Fizica: 10 etc. etc. etc.
How can I do this? I have no idea.. I am a beginner. I have some idea about foreign keys and something like that, but I don't know how to use it. Please help.
You can use 'natural join'.
//Example
SELECT table1.*, table2.*
FROM table1,table2
Where table1.nume = 'Radu';
You can insert a foreign key either through create a table or through the alter table.
After creating a table you can use alter table.
I have a user and pages table, and these two have many to many relationship between them with the bridge table user privileges. What I want to get all the pages name and only those are marked that is assigned to that user.
want some think like this
+---------+----------------------------------+
| user_id | page_name | Assigned|
+---------+----------------------------------+
| 1 | Add Project | 0 |
| 1 | Department | 0 |
| 1 | Category | 1 |
| 1 | Item | 0 |
| 1 | Units | 1 |
| 1 | Stock In | 0 |
| 1 | Stock Card Report | 1 |
+---------+------------------------+---------|
for now my query is this;
Select up.user_id, p.page_name FROM user_privileges up, pages p where p.page_id = up.page_id and up.user_id = 1;
and it returns this;
+---------+------------------------+
| user_id | page_name |
+---------+------------------------+
| 1 | Add Project |
| 1 | Department |
| 1 | Category |
| 1 | Item |
| 1 | Units |
| 1 | Stock In |
| 1 | Stock Card Report |
+---------+------------------------+
The Scheme is this;
table - user
+---------+-----------+
| user_id | user_name |
+---------+-----------+
| 4 | saif |
| 1 | admin |
| 5 | taqi |
| 2 | rashid |
+---------+-----------+
table - pages
+---------+---------------+
| page_id | page_name |
+---------+---------------+
| 2 | Page 1 |
| 3 | Page 2 |
| 5 | Page 3 |
| 6 | Page 4 |
| 7 | Page 5 |
| 8 | Page 6 |
| 9 | Page 7 |
| 10 | Page 8 |
| 11 | Page 9 |
| 13 | Page 10 |
| 14 | Page 11 |
| 15 | Page 12 |
| 16 | Page 13 |
| 18 | Page 14 |
| 19 | Page 15 |
| 20 | Page 16 |
+---------+---------------+
and table user_privalges for user_id = 1 only.
+--------------------+---------+---------+
| user_privileges_id | user_id | page_id |
+--------------------+---------+---------+
| 1 | 1 | 2 |
| 2 | 1 | 3 |
| 3 | 1 | 5 |
| 4 | 1 | 6 |
| 5 | 1 | 7 |
| 6 | 1 | 8 |
| 7 | 1 | 9 |
| 8 | 1 | 10 |
| 9 | 1 | 11 |
| 10 | 1 | 13 |
| 11 | 1 | 14 |
| 12 | 1 | 15 |
| 13 | 1 | 16 |
| 14 | 1 | 18 |
| 15 | 1 | 19 |
| 16 | 1 | 20 |
+--------------------+---------+---------+
Select up.user_id, p.page_name FROM user_privileges up, pages p where p.page_id = up.page_id and up.user_id = 1 AND up.Assigned=1;
"What I want to get all the pages name and only those are marked that is assigned to that user." So with your edit you should try something like that with case statement
SELECT up.user_id, p.page_name,
CASE
WHEN up.page_id=p.page_id THEN '1'
ELSE '0'
END AS Assigned
FROM pages p left join user_privileges up
ON p.page_id = up.page_id
WHERE up.user_id = 1;
If you are only looking for the user_id = 1 you may do something as
select
1 as user_id,
p.page_name,
case when up.page_id is not null then 1 else 0 end as `Assigned`
from pages p
left join user_privalges up on up.page_id = p.page_id and up.user_id = 1
order by p.page_id
http://www.sqlfiddle.com/#!9/06f65/5
i have 3 tables. 2 reference table and one table transactions.
Table puskesmas
mysql> select id,nama from puskesmas;
+----+----------------------+
| id | nama |
+----+----------------------+
| 1 | BAMBANGLIPURO |
| 2 | BANGUNTAPAN |
| 3 | BANTUL |
| 4 | DLINGO |
| 5 | IMOGIRI |
| 6 | JETIS |
| 7 | KASIHAN |
| 8 | KRETEK |
| 9 | PAJANGAN |
| 10 | PANDAK |
+----+----------------------+
Table poli
mysql> select * from poli;
+----+---------------+
| id | nama |
+----+---------------+
| 1 | BP |
| 2 | KIA |
| 3 | GIGI |
| 4 | JIWA |
+----+---------------+
Table loket
mysql> select pasien_id,poli_id,puskesmas_id from loket limit 10;
+-----------+---------+--------------+
| pasien_id | poli_id | puskesmas_id |
+-----------+---------+--------------+
| 1 | 1 | 1 |
| 5 | 2 | 2 |
| 1 | 1 | 3 |
| 9 | 3 | 4 |
| 1 | 3 | 5 |
| 5 | 2 | 1 |
| 1 | 1 | 3 |
| 8 | 1 | 2 |
| 10 | 3 | 6 |
| 5 | 2 | 5 |
+-----------+---------+--------------+
I want to show the total number (count) of visits to puskesmas table. then made field all_total
fter that I want to take patient visits where poli_id = 1 and used as a column bp. for other poly are the same as the
+----+----------------------+--------------+------+------+------+------+
| id | nama | All Total | BP | KIA | GIGI | JIWA |
+----+----------------------+--------------+------+------+------+------+
| 1 | BAMBANGLIPURO | 30 | 10 | 3 | 15 | 2 |
| 2 | BANGUNTAPAN | 35 | 20 | 4 | 11 | 0 |
| 3 | BANTUL | 15 | 10 | 0 | 5 | 0 |
| 4 | DLINGO | 12 | 10 | 1 | 1 | 0 |
| 5 | IMOGIRI | 10 | 5 | 2 | 1 | 2 |
| 6 | JETIS | 25 | 13 | 3 | 7 | 2 |
| 7 | KASIHAN | 20 | 10 | 10 | 0 | 0 |
| 8 | KRETEK | 23 | 20 | 1 | 1 | 1 |
| 9 | PAJANGAN | 10 | 5 | 1 | 3 | 1 |
| 10 | PANDAK | 0 | 0 | 0 | 0 | 0 |
+----+----------------------+--------------+------+------+------+------+
I've tried to make a query to display like this but it always fails to hold. Can anyone help to make such queries desired results
i have tried query like this :
select puskesmas_id,
sum(case when poli_id=1 then 1 else 0 end) bp,
sum(case when poli_id=5 then 0 else 1 end) gigi,
count(id) total
from loket
group by puskesmas_id
and result like this :
+--------------+------+------+-------+
| puskesmas_id | bp | gigi | total |
+--------------+------+------+-------+
| 1 | 97 | 126 | 143 |
| 6 | 74 | 185 | 210 |
| 8 | 131 | 179 | 190 |
| 7 | 90 | 92 | 98 |
| 2 | 33 | 39 | 54 |
| 4 | 158 | 248 | 263 |
| 3 | 66 | 68 | 72 |
+--------------+------+------+-------+
but puskesmas_id the value 0 does not perform data when querying
I want to concatenate and count data of the same column, so I can concatenate but I can not count the repeated data.
Here's my table of data:
| ID | bills | class |
|-----|-------|-------|
| 1 | 0.5 | 2 |
| 2 | 1 | 1 |
| 3 | 0.5 | 2 |
| 5 | 1 | 3 |
| 6 | 0 | 2 |
| 7 | 0.5 | 1 |
| 8 | 1 | 2 |
| 9 | 1 | 3 |
| 10 | 0.5 | 1 |
| 11 | 0 | 2 |
| 12 | 1 | 1 |
| 13 | 0 | 3 |
| 14 | 1 | 2 |
| 15 | 0 | 1 |
| 16 | 0 | 1 |
| 17 | 0.5 | 3 |
| 18 | 0 | 3 |
| 13 | 0.5 | 3 |
Here's my sql query I'm using to concatenate data:
SELECT class AS lesson,
GROUP_CONCAT( bills ORDER BY bills ) AS bills
FROM tb_presence
GROUP BY class;
Here's my result below:
| class | bills |
|-------|------------------|
| 1 | 1,0.5,0.5,1,0,0 |
| 2 | 0.5,0,1,0,1 |
| 3 | 1,1,0,0.5,0,0.5 |
Now I would like to count the data that are equal, but continue with the same concatenation.
I want to "count" the data with the same values and display concatenated (column observation and only to help understanding)
| class | bills | observation |
|-------|-------|-----------------------------|
| 1 | 2,2,2 | (2=0+0) (2=0.5+0.5) (2=1+1) |
| 2 | 2,1,2 | (2=0+0) (1=0.5) (2=1+1) |
| 3 | 2,2,2 | (2=0+0) (2=0.5+0.5) (2=1+1) |
Is this really possible?
Here is a solution (thanks to #wchiquito for the sqlfiddle) See http://sqlfiddle.com/#!2/2d2c8/1
As you can see it cannot dynamically determine the bills' values and count them. But there is a count per bill value that you want.
SELECT class AS lesson,
GROUP_CONCAT( bills ORDER BY bills ) AS bills
,SUM(IF(bills=0,1,0)) AS Count0
,SUM(IF(bills=0.5,1,0)) AS Count05
,SUM(IF(bills=1,1,0)) AS Count1
,COUNT(*) AS totalRecords
,COUNT(*)
- SUM(IF(bills=0,1,0))
- SUM(IF(bills=0.5,1,0))
- SUM(IF(bills=1,1,0))
AS Missing
FROM tb_presence GROUP BY class;
I added an extra record to show how the 'missing' column could show if you were not taking all values into consideration.
Results
| LESSON | BILLS | COUNT0 | COUNT05 | COUNT1 | TOTALRECORDS | MISSING |
|--------|-----------------------------------------|--------|---------|--------|--------------|---------|
| 1 | 0.00,0.00,0.50,0.50,1.00,1.00,1.00,4.00 | 2 | 2 | 3 | 8 | 1 |
| 2 | 0.00,0.00,0.50,0.50,1.00,1.00 | 2 | 2 | 2 | 6 | 0 |
| 3 | 0.00,0.00,0.50,0.50,1.00,1.00 | 2 | 2 | 2 | 6 | 0 |
Would like to get the following as a result from the table structure below (MYSQL + PHP)
array[0][name]1,[desc]red,[title]hero,[desc]strong,[desc2]smells,[img][0]red1,[img][1]red2,[img][2]red3,ext[0].jpg,[ext][1].gif,[ext][2].png,[count][0]253,[count][1]211,[count][2]21,[count][3]121,[dist][0]5,[dist][1]5,[dist][2]12,[dist][3]2,[score][0]2,[score][1]3,[score][2]1,[score][3]5,[score][4]4,[val][0]5,[val][1]1,[val][2]4,[val][3]3,[val][4]4
The problem I have with a simple SELECT, JOIN and GROUP_CONCAT is that the values duplicate after selecting all the images.
I've tried various other ways for example selecting the data by row combined with a foreach loop in PHP, but I end up with lots of duplicates, and it looks very messy.
I also though about splitting it into multiple selects instead of using one, but I really would like to know if it can be done with one select.
Could someone help me with an MYSQL select? Thanks
game
+-----+----------+
| pid | name |
+-----+----------+
| 1 | red |
| 2 | green |
| 3 | blue |
+-----+----------+
detail
+-----+------+--------+-------+--------+
| id | pid | title | desc | desc 2 |
+-----+------+--------+-------+--------+
| 1 | 1 | hero |strong | smells |
| 2 | 2 | prince |nice | tall |
| 3 | 3 | dragon |big | green |
+-----+------+--------+-------+--------+
image
+-----+-----+-----+----+
| id | pid | img |ext |
+-----+-----+-----+----+
| 1 | 1 | red1|.jpg|
| 2 | 1 | red2|.gif|
| 3 | 1 | red3|.png|
+-----+-----+-----+----+
devmap
+-----+-----+-------+------+
| id | pid | count | dist |
+-----+-----+-------+------+
| 1 | 1 | 253 | 5 |
| 2 | 1 | 211 | 5 |
| 3 | 1 | 21 | 12 |
| 4 | 1 | 121 | 2 |
+-----+-----+-------+------+
stats
+-----+-----+-------+------+
| id | pid | scrore| val |
+-----+-----+-------+------+
| 1 | 1 | 2 | 5 |
| 2 | 1 | 3 | 1 |
| 3 | 1 | 1 | 4 |
| 4 | 1 | 5 | 3 |
| 5 | 1 | 4 | 3 |
+-----+-----+-------+------+
When you do a JOIN that involves more than a 1:1 mapping between tables you're going to have duplicate data, and there's no way to get around that in the query.
You can break it out into multiple selects, or you can loop through the result set and pare out whatever duplicate information you don't want.