I have database table kladilnica with 37 values, I want to make the users can send tickets each other, so I have created another table called ticket but that table have 38 values including receiverName so i can easy check who is the receiver and who can see the ticket. I'm going with w3schools example of copying table info and pasting into another table ex. ($sql = "INSERT INTO ticket (senderName, receiverName, Date) SELECT Username, '', Date FROM kladilnica WHERE ticket_id='".$ticketID."'";) this example works well but I have a minor modifications in my example. In the SELECT part i have nothing to select from the kladilnica to get the receiverName and display it into ticket what should I do to get and write the receiverName into ticket table?
$sql = "INSERT INTO ticket (senderName, receiverName, Date) SELECT Username, '".$receiverName."', Date FROM kladilnica WHERE ticket_id='".$ticketID."'";
(and add security for SQL injection of course...)
Related
So, I have a table A that each time a user sends an image, a record is created storing the time it was uploaded, the username of the user and the image number out of all the images uploaded over time.
I need to make a second table B that will store the amount of images uploaded per user and the user name. I need this table B to be updated when a new entry is generated in A.
I found that a trigger function can be created, nevertheless I'm having a rough time finding an example that will suit my needs.
Does anyone know a way of doin what I want?
Just update b table with a select count of total inserted records on a from current user NEW.userid (userid is your column name or whatever name you have there, and NEW is a fixed mySql reference for the current values to be inserted):
CREATE TRIGGER img_sum AFTER INSERT ON a
FOR EACH ROW SET b.total = (SELECT COUNT(*) FROM a WHERE a.userid=NEW.userid)
WHERE b.userid = NEW.userid;
From what you have described i don't think you need a second table. You can just count the number of time a user name has occurred, and you will get the number of images that user has uploaded.
You can get the count doing something like that
SELECT COUNT(DISTINCT username) FROM table_name;
If you still need to create 2 tables, you might want to take a look at procedures and how they work.
Let's say we have 3 tables for this case:
- users(id, username, email ....),
- user_images(id, userId, image_num, date_uploaded)
- user_images_count(id, user_name, images_count)
The user_images_count is initially empty. We have to fill it up by such query:
INSERT into user_images_count(user_name, images_count)
SELECT (select username from users where ui.userId = id) as username, count(userId) as counter FROM `user_images` ui group by ui.userId;
Then, we must immediately create the trigger that will process every INSERT operation into user_images table.
CREATE TRIGGER `count_user_images` AFTER INSERT ON `user_images`
FOR EACH ROW begin
declare u_name tinytext default "";
set u_name = (select username from users where id = NEW.userId limit 1);
if(u_name != "") then
update user_images_count set images_count = images_count + 1 where user_name = u_name;
end if;
end
This two queries (user_images_count fulfillment and trigger creation must be performed in one transaction, one by one).
I've created similar triggers on my local databases. They work pretty good. )))
Good day to all!
I have 1 table (users) that I wish to use to update the uid field in another table (recipes). So, when a user creates a recipe, the uid should be inserted into the recipes table.
This is the trigger I created, followed by the error message:
create trigger users_recipes
after insert on recipes
for each row
update recipes
set uid = users.uid
where users.uid=recipes.uid
Error in INSERT into recipes (type, type2, rname, category, country, recipe, allergy, diet, path, pathvideo, posted) VALUES ('','','insert uid','','United States','blah
1/2 more blah','a:1:{i:0;s:3:"Nut";}','Omnivorous','','','2014-11-04') == ----->Can't update table 'recipes' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
If anyone could help me understand what I did wrong, I would greatly appreciate it.
Thanks so much in advance!
I want to insert data partially from select statement..
For example..
I have one table named movie..here's the fields :
-id_movie
-tittle
-studio
-time
And another table named reservation.. here's the fields :
-id_reservation
-tittle
-studio
-time
-seat_1
-seat_2
So, I want to insert value of tittle, studio, and time into reservation table that getting from select statement from movie table. But I'm a little bit confuse about another field in reservation table (id_reservation, seat_1, seat_2).. They're actually don't exist in the first table (movie table)
so how to write the query?
any simple example would be very helpful
thank you
$query = "INSERT INTO reservation(tittle,studio,time)
SELECT tittle,studio,time FROM movie";
INSERT INTO reservation (
tittle,
studio,
time
)
SELECT tittle,
studio,
time
FROM movie;
But you better not have NOT NULL on the columns you leaving without values.
If you want mysql query then:
"INSERT INTO reservation(tittle,studio,time)
SELECT tittle,studio,time from movie";
First do a SELECT from "movie" to obtain the fields you need from that table.
You will have the fields you need stored in 3 variables, say $title, $studio, $time.
As per the table reservation, the field id_reservation should be the PK so set it to autoincrement. You don't have to insert that value as it does it automatically in every insert.
The fields seat_1 and seat_2 will depend on other facts than the data you get from the first table. You should obtain the free seats (I guess there is another table with the total amount of seats), and select 2 using some kind of logic (for example, that they are next to each other)
So in the end, the INSERT query for the table reservation should look like
"INSERT INTO reservation (title, studio, time, seat_1, seat_2) VALUES('$title', '$studio', '$time', $seat_1, $seat_2)");
Using PHP and MySQL, I have a query that will look something like this:
UPDATE mytable
SET status='$newstatus'
WHERE (col1='$col1[0]'AND col2='$col2[0]')
OR (col1='$col1[1]'AND col2='$col2[1]')
OR (...);
I actually need to record the current 'status' of each of these rows before the update. Do I need to do a separate SELECT before this, or can (should / how would) I combine the two queries?
You cannot get that from this query (you could only get number of affected rows, but that's it). If you need that, you shall first do SELECT on your conditions like:
SELECT `id` FROM `mytable`
WHERE (`col1`='$col1[0]' AND `col2`='$col2[0]')
OR (`col1`='$col1[1]' AND `col2`='$col2[1]')
OR (...)
and then do UPDATE with WHERE using fetched ids. I do not recommend doing UPDATE with your current WHERE clause as in meantime (between your SELECT and UPDATE) db content could change, so you could be UPDATING different rows that you had SELECTed. Or use table locking (but I do not think it makes sense here).
No OUTPUT clause in Mysql. You need to either read status prior to update or create a trigger that stores value of OLD.status in other table.
You can't have a single query to update the row and record the current status before updating.
You'd better have a "log table", with the same schema of your "table" plus a timestamp, but it would store only historical data, the status of a row in a single point in time, like a versioning system.
Example:
Table User: Id, Username, Email, Telephone
Table UserLog: Id, Username, Email, Telephone, Timestamp
So, before updating a row on table User, you'd first do a SELECT and an INSERT, like this:
insert into UserLog
select Id, Username, Email, Telephone, Now() from User where Id=$Id
I am writing a converter to transfer data from old systems to new systems. I am using php+mysql.
I have one table that contains millions records with duplicate entries. I want to transfer that data in a new table and remove all entries. I am using following queries and pseudo code to perform this task
select *
from table1
insert into table2
ON DUPLICATE KEY UPDATE customer_information = concat('$firstName',',','$lastName')
It takes ages to process one table :(
I am pondering that is it possible to use group by and get all grouped record automatically?
Other than going through each record and checking duplicate etc.?
For example
select *
from table1
group by firstName, lastName
insert into table 2 only one record and add all users'
first last name into column ALL_NAMES with comma
EDIT
There are different records for each customers with different information. Each row is called duplicated if first and last name of user is same. In new table, we will just add one customer and their bought product in different columns (we have only 4 products).
I don't know what you are trying to do with customer_information, but if you just want to transfer the non-duplicated set of data from one table to another, this will work:
INSERT IGNORE INTO table2(field1, field2, ... fieldx)
SELECT DISTINCT field1, field2, ... fieldx
FROM table1;
DISTINCT will take care of rows that are exact duplicates. But if you have rows that are only partial duplicates (like the same last and first names but a different email) then IGNORE can help. If you put a unique index on table2(lastname,firstname) then IGNORE will make sure that only the first record with lastnameX, firstnameY from table1 is inserted. Of course, you might not like which record of a pair of partial duplicates is chosen.
ETA
Now that you've updated your question, it appears that you want to put the values of multiple rows into one field. This is, generally speaking, a bad idea because when you denormalize your data this way you make it much less accessible. Also, if you are grouping by (lastname, firstname), there will not be names in allnames. Because of this, my example uses allemails instead. In any event, if you really need to do this, here's how:
INSERT INTO table2(lastname, firstname, allemails)
SELECT lastname, firstname, GROUP_CONCAT(email) as allemails
FROM table1
GROUP BY lastname, firstname;
If they are really duplicate rows (every field is the the same) then you can use:
select DISTINCT * from table1
instead of :
select * from table1