I have 2 table(example A and B)
A
-----------
id | name
-----------
1 | Bruce
2 | Peter
3 | Jack
4 | Alin
B
---------------------
id | status | A_id
---------------------
1 | 0 | 1
2 | 0 | 3
Subtraction with 2 table or php , I want to result is C
C
------------
id | name
------------
2 | Peter
4 | Alin
How can I do it?
Please give a try. Your C is a records that not shown from B right?
SELECT * From table a where id NOT IN (SELECT a_id from B)
Related
I wanted to UPDATE the value of my below table (row & col_md) :
Current Data
| id | id_cat | row | col_md |
| --- | ------ | ---- | ------ |
| 1 | 1 | 1 | 4 |
| 2 | 1 | 2 | 5 |
| 3 | 1 | 3 | 5 |
| 4 | 2 | 1 | 3 |
| 5 | 2 | 2 | 4 |
| 6 | 2 | 2 | 4 |
| 7 | 3 | 1 | 12 |
| 8 | 3 | 1 | 12 |
| 9 | 3 | 2 | 3 |
That may look something like the below table. (I want to have the same content of rows that id_cat=1 have, in rows with id_cat=2 & 3).
Required Data:
| id | id_cat | row | col_md |
| --- | ------ | ---- | ------ |
| 1 | 1 | 1 | 4 |
| 2 | 1 | 2 | 5 |
| 3 | 1 | 3 | 5 |
| 4 | 2 | 1 | 4 |
| 5 | 2 | 2 | 5 |
| 6 | 2 | 3 | 5 |
| 7 | 3 | 1 | 4 |
| 8 | 3 | 2 | 5 |
| 9 | 3 | 3 | 5 |
id_cat 2 and 3 should have the same "row" and "col_md" values as in id_cat=1.
I've tried with this post first answer like this:
UPDATE `myTable` AS t1 JOIN `myTable` AS t2 ON t2.id_cat=1
SET t1.row = t2.row, t1.col_md = t2.col_md
WHERE t1.id_cat = 2 or t1.id_cat=3;
but that results on all "row" column values equal to 1.
What I'm doing wrong and what's the way to do this right?
EDIT:
The tables above are just examples to make this ask easier to understand, but the real table is bigger (4k rows) and:
"row" column with id_cat=1 can have any number and not a sequence as in the example.
"col_md" columns can have any number too.
That's why the update must set a copy of the id_cat=1 "row" and "col_md" values in the id_cat!=1 "row" and "col_md" values.
If this can't be done with just MySQL, a php script will be nice too.
In the example query you gave, you are updating t1.row with t2.row. As you are joining on the id_cat, this will result in multiple rows selected to update a single row, so the outcome just takes the first row.
What you actually want, is to make the 1-to-1 relation in the update, so what needs to be changed in your query is to add the row matching in the join and remove the assignment in the SET, like this:
UPDATE `myTable` AS t1 JOIN `myTable` AS t2 ON t2.id_cat=1 AND t1.row = t2.row
SET t1.col_md = t2.col_md
WHERE t1.id_cat = 2 or t1.id_cat=3;
Which then gives the output of:
MariaDB [testart]> select * from myTable;
+------+--------+------+--------+
| id | id_cat | row | col_md |
+------+--------+------+--------+
| 1 | 1 | 1 | 4 |
| 2 | 1 | 2 | 5 |
| 3 | 1 | 3 | 5 |
| 4 | 2 | 1 | 4 |
| 5 | 2 | 2 | 5 |
| 6 | 2 | 3 | 5 |
| 7 | 3 | 1 | 4 |
| 8 | 3 | 1 | 4 |
| 9 | 3 | 2 | 5 |
+------+--------+------+--------+
9 rows in set (0.00 sec)
Currently able to achieve the SQL query for your desired result.
SELECT t2.id_cat, t1.row, t1.col_md
FROM (SELECT row, col_md from mytable WHERE id_cat=1) as t1 , mytable as t2
GROUP BY t2.id_cat, t1.row, t1.col_md
The above will return the following..
I suggest to use INSERT statement along with the above query to put the record into a new table and drop the old one.
Cheers!
EDITED...
Instead of Updating table, alternate approach could be to Insert the required record into a new table.
This can be achieved with following four steps
Create a tmp table with same fileds (id Auto_Increment, id_cat, row, col_md)
Insert to tmp table with this statement...
INSERT INTO tmp(id_cat, row, col_md)
SELECT t2.id_cat, t1.row, t1.col_md
FROM (SELECT row, col_md from mytable WHERE id_cat=1) as t1 , mytable as t2
GROUP BY t2.id_cat, t1.row, t1.col_md
Remove/Rename 'myTable'.
Rename 'tmp' table to 'myTable'.
Hope this will serve the purpose...
Cheers!
it's not enough to tell which group you want the data from, you need to match id to id.
in your case t2.id 4 and 7 to t1.id 1, t2.id 5 and 8 to t1.id 2, and t2.id 6 and 9 to t1.id 3.
SELECT #d := COUNT(*) FROM myTable WHERE id_cat = 1;
UPDATE `myTable` AS t1
JOIN `myTable` AS t2 ON t2.id_cat=1 AND
t2.id = IFNULL(NULLIF(t1.id MOD #d, 0), #d)
SET t1.row = t2.row, t1.col_md = t2.col_md
WHERE t1.id_cat = 2 or t1.id_cat=3;
#d holds the number of lines where id_cat = 1
we divide t1.id by #d and match the remainder (MOD) to t2.id.
when t1.id is multiple of #d the remainder is 0 and we have to match it to #d
so we make 0 into NULL and NULL into #d
In my understanding, the difficult part about this question is to relate each record to update (ie each record with id_cat IN (2, 3)) to the relevant original record (record with id_cat = 1).
Based on your sample data, I understand that you expect series of records for each id_cat (I can see three groups of three records, sorted by increasing id), so I would assume that you want to relate each record to the original that has the same sequence in the group of record where id_cat = 1.
Assuming MySQL 8.0, a typical approach to assign a number to a record within a group is ROW_NUMBER(). Consider this simple query:
SELECT
t.*,
ROW_NUMBER() OVER(PARTITION BY id_cat ORDER BY id) rn
FROM t
Yields:
| id | id_cat | rw | col_md | rn |
| --- | ------ | --- | ------ | --- |
| 1 | 1 | 1 | 4 | 1 |
| 2 | 1 | 2 | 5 | 2 |
| 3 | 1 | 3 | 5 | 3 |
| 4 | 2 | 1 | 3 | 1 |
| 5 | 2 | 2 | 4 | 2 |
| 6 | 2 | 2 | 4 | 3 |
| 7 | 3 | 1 | 12 | 1 |
| 8 | 3 | 1 | 12 | 2 |
| 9 | 3 | 2 | 3 | 3 |
Now with this set-up in mind, we can turn this query to a Common Table Expression (available also starting MySQL 8.0), and JOIN it as need with the original table to do the UPDATE:
WITH cte AS (
SELECT
t.*,
ROW_NUMBER() OVER(PARTITION BY id_cat ORDER BY id) rn
FROM t
)
UPDATE t t0
INNER JOIN cte t1 ON t1.id = t0.id
INNER JOIN cte t2 ON t2.id_cat = 1 AND t2.rn = t1.rn
SET t0.rw = t2.rw, t0.col_md = t2.col_md
WHERE t0.id_cat IN (2, 3)
Details:
t0 is the original table, where records having id_cat IN (2, 3) need to be updated
t1 is the corresponding record in the CTE (to which a row number was assigned)
t2 is the record in the CTE that has id_cat = 1 and the same row number as the record being updated
Demo on DB Fiddle:
| id | id_cat | rw | col_md |
| --- | ------ | --- | ------ |
| 1 | 1 | 1 | 4 |
| 2 | 1 | 2 | 5 |
| 3 | 1 | 3 | 5 |
| 4 | 2 | 1 | 4 |
| 5 | 2 | 2 | 5 |
| 6 | 2 | 3 | 5 |
| 7 | 3 | 1 | 4 |
| 8 | 3 | 2 | 5 |
| 9 | 3 | 3 | 5 |
I want add one filed to result of queries in MySQL.
this tables is my database tables :
tbl_user
id_user | username | password
-----------------------------
1 | Pooria | 123456
2 | mary | 123456
3 | july | 123456
4 | Ali | 123456
5 | shahla | 123456
tbl_category
id_category | name
--------------------
1 | BMW
2 | Toyota
3 | Benz
tbl_content
id_content | message | ContentLike
--------------------------------------
1 | Best Car | 2
2 | Best Car | 3
3 | Best Car | 4
4 | Best Car | 1
5 | Best Car | 1
tbl_user_category_content
id | id_user | id_category | id_content
----------------------------------------
1 | 2 | 2 | 4
1 | 3 | 3 | 3
1 | 4 | 3 | 5
1 | 5 | 1 | 2
tbl_user_like
id_user_like | id_user | id_content
-------------------------------------
1 | 2 | 5
1 | 2 | 3
1 | 5 | 1
1 | 4 | 2
1 | 4 | 2
My Query in Mysql :
SELECT tbl_content.id_content ,tbl_content.message,tbl_content.ContentLike,tbl_category.name,tbl_user.username
FROM tbl_user_category_content
INNER JOIN tbl_user ON
tbl_user_category_content.id_user = tbl_user.id_user
INNER JOIN tbl_cat ON
tbl_user_category_content.id_category = tbl_cat.id_category
INNER JOIN tbl_post ON
tbl_user_category_content.id_content = tbl_content.id_content
and Result
id_content | message | ContentLike | username
----------------------------------------------
1 | Best Car | 2 | Pooria
2 | Best Car | 4 | mary
3 | Best Car | 3 | july
4 | Best Car | 5 | Ali
5 | Best Car | 4 | shahla
I expect Result :
I want insert a id_user and view Result:
example : insert id_user : 2 (mary)
id_content | message | ContentLike | username | Like_User
-------------------------------------------------------------------
1 | hello world1 | 4 | Pooria |
2 | hello world2 | 2 | mary |
3 | hello world3 | 2 | july | Yes
4 | hello world4 | 2 | Ali |
5 | hello world5 | 2 | shahla | Yes
add result Like_User
important:I want all entries in the database with the person who likes to show a distinct field. thanks you for help me <3
Add this in the select columns :
case when tbl_user.id_user=tbl_user_like.id_user then 'Yes' else 'No' end as Like_User
So it would be something like this
SELECT tbl_content.id_content ,tbl_content.message,tbl_content.ContentLike,tbl_category.name,tbl_user.username, case when tbl_user.id_user=tbl_user_like.id_user then 'Yes' else 'No' end as Like_User
FROM tbl_user_category_content
INNER JOIN tbl_user ON
tbl_user_category_content.id_user = tbl_user.id_user
INNER JOIN tbl_cat ON
tbl_user_category_content.id_category = tbl_cat.id_category
INNER JOIN tbl_post ON
tbl_user_category_content.id_content = tbl_content.id_content
I have not test it. Try it out and maybe you should change the column names in the case
Try This Query
SELECT distinct tbl_content.id_content ,tbl_content.message,tbl_content.ContentLike,tbl_category.name,tbl_user.username,tbl_user_category_content.category
FROM tbl_user_category_content
INNER JOIN tbl_user,tbl_cat,tbl_post ON
tbl_user_category_content.id_user = tbl_user.id_user
tbl_user_category_content.id_category = tbl_cat.id_category
tbl_user_category_content.id_content = tbl_content.id_content
WHERE tbl_user.id_user='$user_id'
I want a page that displaying data client. Here's my page that I want:
----------------------------------
name | skill A | skill B
----------------------------------
John | PHP | MySQL, Javascript
Doe | Javascript | MySQL
Richard | PHP | Javascript
----------------------------------
and here are my MySQL tables:
client table:
-----------------------------------------
id_client | name_client | email_client
-----------------------------------------
1 | John | john#email.com
2 | Doe | doe#email.com
3 | Richard | richard#email.com
------------------------------------------
skill table
-----------------------------
id_skill | name_skill
-----------------------------
1 | PHP
2 | MySQL
3 | Javascript
-----------------------------
client_skill
---------------------------------
skill | client | status
---------------------------------
1 | 1 | A
2 | 1 | B
3 | 2 | A
2 | 2 | B
1 | 3 | A
3 | 3 | B
---------------------------------
From these I want to diplaying data that join three tables group by id_client and each client has skill that group by value of skill client that A and B.
So I want to display client skill A and client Skill B in one row. What query should use and how to echoing in JSON so I can display it in angularjs?
this is your Query.
SELECT a.name_client,
MAX(CASE WHEN b.status = 'A' THEN c.name_skill END) 'SKILL A',
MAX(CASE WHEN b.status = 'B' THEN c.name_skill END) 'SKILL B'
FROM client a
LEFT JOIN client_skill b ON b.client = a.id_client
LEFT JOIN skill c ON c.id_skill = b.skill
GROUP BY a.id_client
ORDER BY id_client
I have a MySQL table that is formatted as follows:
group_clue:
---------------------------------------------------
| id | group_id | clue_id | completed | run_order |
---------------------------------------------------
| 1 | 1 | 2 | 1 | 1 |
| 2 | 1 | 6 | 1 | 2 |
| 3 | 1 | 4 | 1 | 3 |
| 4 | 1 | 3 | 0 | 4 |
| 5 | 1 | 1 | 0 | 5 |
| 6 | 1 | 5 | 0 | 6 |
| 7 | 2 | 9 | 1 | 1 |
| 8 | 2 | 2 | 0 | 2 |
...
---------------------------------------------------
The data above in the group_clue is constructed such that each group_id has every clue_id at some run_order (ranging from 1 to the number of clue_ids and not repeating for a particular group).
First Question
I want to create a table showing the first clue_id for each group_id where completed = 0 when ordered by run_order (aliased as current_clue). Using the above example, this would give:
---------------------------
| group_id | current_clue |
---------------------------
| 1 | 3 |
| 2 | 2 |
---------------------------
My preliminary attempt is:
SELECT group_id, MIN(clue_id) as current_clue
FROM group_clue
WHERE completed = 0
GROUP BY group_id
However, this returns the same clue_id for each group_id.
Second Question
From the data in the first question, I would like to compose a final table where I GROUP_CONCAT() these results so that it contains every current_clue and each group_id that contains that current_clue. I would also like it ordered from those clues with the most group_ids to those with the fewest. An example resulting table is:
--------------------
| clue | group_ids |
--------------------
| 3 | 1,5,4,3 |
| 2 | 2,6 |
--------------------
I cannot figure out the ordering. My preliminary attempt is:
SELECT clue_id, GROUP_CONCAT(group_id)
FROM [resulting_table]
GROUP BY clue_id
ORDER BY [something]
Any help is appreciated: what queries would fit this scenario?
The first part of your question can be solved this way (it expects that run_order is unique per group):
SELECT t1.group_id,
t1.clue_id AS current_clue
FROM group_clue t1
INNER JOIN (SELECT group_id,
MIN(run_order) as run_order
FROM group_clue
WHERE completed = 0
GROUP BY group_id) t2 USING (group_id, run_order)
The logic of this query is pretty simple:
The inner query selects the pairs of group_id and the corresponding minimal value of run_order which has the completed = 0.
After that we join the original table to this set of pairs so that we could select the corresponding clue_id additionally.
You can sort by number of elements per group using
ORDER BY COUNT(*) DESC
I am trying to figure out how to select an item from table by his column name p.e.
strucutre looks like this
table items
id | name | column_1 | column_2 | column_3 |
1 | nm1 | 1 | 4 | 7,8 |
2 | nm2 | 2,3 | 4 | 9 |
3 | nm3 | 3,1 | 4 | 7 |
table columns
id | c_name |
1 | cnm1 |
2 | cnm2 |
3 | cnm3 |
table column_values
id | c_id | value |
1 | 1 | abcd |
2 | 1 | cdbh |
3 | 1 | dsff |
4 | 2 | wewe |
5 | 2 | cgbh |
6 | 2 | cdlh |
7 | 3 | adbh |
8 | 3 | qdbh |
9 | 3 | pdbh |
So when I wanted to find "abcd" I tried
"SELECT a.* FROM items a, columns b, column_values c WHERE c.`value` LIKE '%abcd%' GROUP BY a.`id`"
but I knew this will find nothing without any conections so i went further
"SELECT a.* FROM items a, columns b, column_values c WHERE c.`value` LIKE '%abcd%' AND b.`id` = c.`c_id` GROUP BY a.`id`"
still no proper connection with item
and here is the problem there is a changing amount of columns and the name contains id of the column and value is set of ids of column values.
So i need to select item by his name which is "name+"column_id in column_values by FIND IN SET cause if i look for abcd it is id 1 and there are two items which have id 1 in column_1
item 1 and item 2
ALSO id of values are AI so there is not possibility of duplicate so there is no need to check of column_id to search in proper column in item table
it can work something like for from 0 - 30 p.e. and it will search in column_1, column_2 column_3 until 30 for id match