The context :
I have these three simple SQL tables : my database diagram
a Request has one or N Request_Field
Request_Field is a pivot table
Value inside the pivot table Request_Field can sometimes contain dates in string format
a Field has 0 or N Request_Field
These tables are part of a greater database and I cannot change them at the moment.
My question :
Is it possible to query multiple "Request" and order them by a specific value in "Request_Field" ?
Example :
Request table
id
1
2
3
Request_Field table
id
request_id
field_id
value
1
1
1
John
2
1
2
2021-01-01
3
2
1
Jane
4
2
2
2020-01-01
5
3
1
Jack
6
3
2
2022-01-01
Field table
id
label
1
name
2
desired_date
The SQL query I try to make : get all Request ordered by the desired_date record of the Field table (DESC).
Request desired results
id
3
1
2
Thank you
Related
I have control dashboard where multiple tables are listed with query
And in dashboard I can switch it to one table from ALLData to User1Table... and vice versa.
When there is only one table chosed I can easily manipulate data. However, I am struggling with updating rows when ALLData(all tables) are listed in dashboard. I can update it checking each table. I was wondering is there any better way to update it.
Tables have no DR. All tables have same column names.
//ALLData
SELECT * FROM users1
UNION ALL
SELECT * FROM users2...
user1
id name tel status
1 Bob 911 1
user2
id name tel status
3 Anna 11 0
3 Jack 12 1
//ALLData in dashboard
id name tel status
1 Bob 911 1
3 Anna 11 0
3 Jack 12 1
I can use id and status as PK
I have a table usersbooks:
idUser - int
idBook - int
bookSummary - text
and this situation:
idUser idBook bookSummary
1 1 modifiedInfoAboutTheBookByTheUser
1 2 modifiedInfoAboutTheBookByTheUser
1 3 modifiedInfoAboutTheBookByTheUser
2 1 modifiedInfoAboutTheBookByTheUser
2 3 modifiedInfoAboutTheBookByTheUser
3 2 modifiedInfoAboutTheBookByTheUser
3 3 modifiedInfoAboutTheBookByTheUser
I need to insert a record like
#user #book initalInfoAboutTheBook
for each combination book user (with the corresponding initial infos), but some record are still there and must NOT be overwritten or updated for they could be different from the initial ones. Some are missing, like user 2 that has not book 2 and user 3 that has not book 1, and these are the one that must be inserted.
Assuming I can make several queries into a for cycle, one cycle for each book, like
"INSERT INTO usersbooks
idBook='+idBook+' ..... "
with idBook 0 to 10, for example
what must be the INSERT query to get the desired result without touching the existing record?
idUser idBook bookSummary
1 1 modifiedInfoAboutTheBookByTheUser
1 2 modifiedInfoAboutTheBookByTheUser
1 3 modifiedInfoAboutTheBookByTheUser
2 1 modifiedInfoAboutTheBookByTheUser
2 2 initalInfoAboutTheBook (newly inserted!)
2 3 modifiedInfoAboutTheBookByTheUser
3 1 initalInfoAboutTheBook (newly inserted!)
3 2 modifiedInfoAboutTheBookByTheUser
3 3 modifiedInfoAboutTheBookByTheUser
NB: There are TWO problems here: how to avoid touching existing record and how to execute the query for any user already present in the db
an easy solution can be this.
you can try to make a primary key with the two fields idUser and idBook,
then use an Insert Ignore. that way avoid the duplicate key error, and insert just when the primary key(the combination of that two ids) doesn't exists.
![enter image description here][1]In the First Table tblserialnumbersprimary i have a primary field called as serialNoId ,this field is repeating multiple times in the second table tblserialnumbers. when we are inserting multiple records with that serialNoId.
I want to get Distinct records from the first table i.e tblserialnumbersprimary and corresponding multiple records from the dependent table i.e tblserialnumbers in MySQL
First Table Fields are:
tblserialnumbersprimary (serialNoId,serialPO,serialProductNo,
SerialNumberMode,serialNoAutoPrefix,serialDateOfCreation,
serialModifiedBy,serialStatus)
Second Table Fields are:
tblserialnumbers(serialId,serialNoId,
serialNo,serialNoBatchId![enter image description here][1])
I tried With This Joins Query.But its giving multiple records of first table
select * FROM tblserialnumbersprimary
LEFT OUTER JOIN tblserialnumbers
ON (tblserialnumbersprimary. serialNoId = tblserialnumbers.serialNoId )
First Table values are:
serialNoId serialPO serialProductNo SerialNumberMode serialNoAutoPrefix serialDateOfCreation serialModifiedBy serialStatus
1 PO1 PROD121 Automatic TCS-03 2/25/2014 12:00:00 AM admin 0
2 PO2 PROD345 Automatic TCS-03 2/25/2014 12:00:00 AM admin 1
3 PO5 PROD816 Automatic 2/26/2014 12:00:00 AM admin 1
4 PO1 PROD121 Automatic GTS-03 2/26/2014 12:00:00 AM admin 1
Second Table values are:
serialId serialNoId serialNo serialNoBatchId
1 1 TCS-03-PROD121-1 batch1
2 1 TCS-03-PROD121-2
3 1 TCS-03-PROD121-3 batch3
4 1 TCS-03-PROD121-4
5 1 100
6 1 101
1 2 TCS-03-PROD345-1 batch1
2 2 TCS-03-PROD345-2
3 2 TCS-03-PROD345-3 batch3
4 2 TCS-03-PROD345-4
1 3 --1
2 3 --2
3 3 --3
4 3 --4
5 3 12
6 3 13
7 3 11
1 4 -PROD816-1 batch1
2 4 -PROD816-2 batch2
1 5 GTS-03-PROD121-1 batch1
2 5 GTS-03-PROD121-2
3 5 GTS-03-PROD121-3 batch3
4 5 GTS-03-PROD121-4
Use alias and join for record in multiple table.
For i.e. `SELECT table2.id,
table1.pid,
table1.color,
table2.pname,
table2.image
FROM tbl_productcolor table1
JOIN tbl_product table2 ON table1.pid = table2.id;`
Apply your table in this way you can get all the data.
How can we update table 1 such that it will replace b field value of table 1 by that of table 2 where a field value are found same?
Suppose I have two tables
table 1
fields a b c
1 5 10
1 5 8
2 5 0
1 4 11
and
table 2
fields a b
1 6
1 7
2 5
1 4
I'm going on 6th form knowledge so I'll leave the code for you to do, but here's basically how I'd do it:Select all values from table 2For each value, select the rows from table 1 with the matching 'a' valueCount number of matching valuesIf it's over one, update table 1 set 'b' as the new value where 'a' matches
Edit: Oh, just realised, the 'a' values aren't unique, unless both tables have matching ID for each row, I'm not sure you can do it.
table A
id name group_id email
1 a 1 a#g.com
2 b 3,4 b#g.com
3 c 1,3,4 c#g.com
4 d 2,5,1 d#g.com
table b
id user user_group_id
1 x 1,3
The table structure is as above
OUTPUT: if i search for user_group_id (from table B) for 1,3 in table A then i should get 4 email addresses i.e a#g.com,b#g.com,c#g.com,d#g.com. Since 1 is present in 3 rows in table A and 3 is present in 2 rows.
While I don't exactly understand what your problem is, I have the impression that your table structure is not properly normalized.
Your table b should have two entries:
id user user_group_id
1 x 1
2 x 3
In this case, you can properly join your tables and get all answers when querying for a certain user name.