I have multiple MYSQLI tables for multiple details and options about a touristic package.
I have package containing the main information, then I have package_option which contains unknown number of options added to the package, and there's package_images which contains the images.
I want to get all the information in one query, but it's prooving a difficult task. Let me explain.
I've used JOIN with but the problem was if the package_option had 3 options and the package_images had 6 images, the result was a 6*4 plus 1 (package) result table.
I would like a result containing all the fields, as many as they originaly are in the tables, not multiplied for each match in every table.
For example, the table I aim for looks like that:
-------------------------------------------------------------------------
| ID | name | description | price | option | image | size | explanation |
-------------------------------------------------------------------------
| 1 | test | some desc | 50 $ | opt. 1 | img1 | 30 | |
| | | | | opt. 2 | img2 | | |
| | | | | opt. 3 | img3 | | |
| | | | | | img4 | | |
| | | | | | img5 | | |
| | | | | | img6 | | |
Right now, the above table gets populated in every field, but it's multiplied, so I don't get only 6 rows, but 24.
I did a lot of JOINS, I'm not a beginer, which is even more frustrating, but it's the first time I try to do that, a select from multiple tables with different columns and unknown number of rows.
package_option and package_images looks like that:
-------------------------------------
| ID | package_id | option / image |
-------------------------------------
| 1 | 1 | opt. 1 / img 1 |
| 2 | 2 | opt. 2 / img 2 |
..... etc
so I don't know how many rows I'll have.
Thank you in advance for t
Related
I'm trying to break up a SQL table that needs to take a users name and find the unique user ID's from up to 4 systems.
The data is currently like this:
| Name | User_ID |
-----------------
| A | 10 |
| A | 110 |
| A | 1500 |
| A | 4 |
| B | 20 |
| B | 100 |
| B | 2 |
| C | 10 |
I need to pivot it around the user's name to look like this (the id's don't need to be in numerical order as the SYS#_ID for each doesn't matter):
| Name | SYS1_ID | SYS2_ID | SYS3_ID | SYS4_ID |
------------------------------------------------
| A | 4 | 10 | 110 | 1500 |
| B | 2 | 20 | 100 | NULL |
| C | 10 | NULL | NULL | NULL |
This is the code I have tried on MySQL:
PIVOT(
COUNT(User_ID)
FOR Name
IN (SYS1_ID, SYS2_ID, SYS3_ID, SYS4_ID)
)
AS PivotedUsers
ORDER BY PivotedUsers.User_Name;
I'm unsure if PIVOT works on MySQL as I keep getting an error "PIVOT unknown". Is there a way to find the values that each user has and if they do not appear in the table already add them to the next column with a max of 4 values?
I have two tables similar to these (t_stamp would normally be a DATETIME, abbreviated here for clarity):
datapoints
+------+---------+----+---------+
| ndx | value | ID | t_stamp |
+------+---------+----+---------+
| 1 | 503.42 | 1 | 3/1/15 |
| 2 | 17.81 | 2 | 3/1/15 |
| 4 | 498.21 | 1 | 3/2/15 |
| 4 | 19.51 | 2 | 3/2/15 |
+------+---------+----+---------+
parameters
+------+----+---------------+-------+
| ndx | ID | description | unit |
+------+----+---------------+-------+
| 1 | 1 | wetwell level | ft |
| 2 | 2 | effluent flow | MGD |
+------+----+---------------+-------+
I'm looking to combine them so that the descriptions become column headers and list the values in order of time stamp, end result looking something like this:
new table
+---------+---------------+---------------+
| t_stamp | wetwell level | effluent flow |
+---------+---------------+---------------+
| 3/1/15 | 503.42 | 17.81 |
| 3/2/15 | 498.21 | 19.51 |
+---------+---------------+---------------+
Bearing in mind, I have considerably more rows in each table so I'm looking for something dynamic. It could be query or stored procedure based. Thank you for any help!
I am trying to get average of latency for each items that holds into two separate mysql table. Let me more clarify that I have two mysql tables as below,
table: monitor_servers
+-----------+-----------------+
| server_id | label |
+-----------+-----------------+
| 1 | a.com |
| 2 | b.com |
+-----------+-----------------+
table: monitor_servers_uptime
+-------------------+-----------+-----------+
| servers_uptime_id | server_id | latency |
+-------------------+-----------+-----------+
| 1 | 1 | 0.4132809 |
| 3 | 1 | 0.4157769 |
| 6 | 1 | 0.4194210 |
| 9 | 1 | 0.4140880 |
| 12 | 2 | 0.4779439 |
| 15 | 2 | 0.4751789 |
| 18 | 2 | 0.4762829 |
| 22 | 2 | 0.4706681 |
+-------------------+-----------+-----------+
Basically, each domains associated with the same id_number in both tables. While I am running the query below, getting average of each items.
select monitor_servers.label, avg(monitor_servers_uptime.latency)
from monitor_servers,monitor_servers_uptime
where monitor_servers.server_id = monitor_servers_uptime.server_id
group by monitor_servers.server_id;
The query ended up,
+---------------------+-------------------------------------+
| label | avg(monitor_servers_uptime.latency) |
+---------------------+-------------------------------------+
| a.com | 0.41393792995 |
| b.com | 0.47551423171 |
+---------------------+-------------------------------------+
My questions are doing am i in wright way while getting average of the each items and how can i insert new average result of each items into a new column on table monitor_servers ? And also what happens if some of latency rows are NULL ?
**Edit : What i am trying to achieve in one query result is **
+-----------+----------+------------------+
| server_id | label | avg. |
+-----------+----------+------------------+
| 1 | a.com | 0.41393792995 |
| 2 | b.com | 0.47551423171 |
+-----------+-----------------------------+
Thanks in advance,
Your calculation seems to be correct.
You could add another column to the monitor_servers using sql:
ALTER TABLE monitor_servers ADD avg_latency DEFAULT 0.0 NOT NULL
For doing the AVG calculation check this answer.
I want to create a webpage where user can organize things they collect. As everyone collects something else I want to have the users create their own datamodell (with strict limitations). If two people are collection the same "things" they can share a datastructure.
My idea was to give every collection an ID and all the tables belonging to that collection will have the ID as a prefix.
Table: Collections
ID | Collection
1 | Poststamps
2 | Barbie Dolls
Table: 1_Base
ID | StampValue | StampPic
....
Table: 2_Base
ID | EAN | Pic
....
Thus I would create many tables as each user could in theory create their own collection. I could also use only one very big table and a mapping table. Example:
Table: Colleactions
ID | Collection
1 | Poststamps
2 | Barbie Dolls
Table: Mapping
fkCollection | FieldName | Mapping
1 | DoubleField1 | StampValue
1 | BlobField1 | StampPic
2 | StringField1 | EAN
2 | BlobField1 | StampPic
Table: CollectionData
fkCollection | DoubleField1 | ... | DoubleField10 | StringField1 | ... | Stringfield10 | BlobField1 | ...
1 | 30 | | | | | | ... |
2 | | | | 21312412414 | | | ... |
Any other ideas?
Thanks for your help!
From what I can see, your second way of attempting this is going to be the easiest way... your queries will be ten fold simpler to handle, and you wouldn't need to programmably create tables on the fly... so my suggestion would be to modify your second idea slightly... Just to clarify something also, A blob will slow down the query speed so I am changing the block to hold the source link to the image instead.
TABLE: Collections
ID| Collection
1 | Poststamps
2 | Barbie Dolls
Table: CollectionData
fkCollection | DataType | VALUE | FieldName |
1 | Double | 30 | StampID |
1 | String | London | StampName |
1 | ImgSrc | ../loc | StampPic |
2 | String | Ken | BarbieName |
2 | ImgSrc | ../loc | BarbiePic |
I have a Microsoft Reporting Services report (local report, VS2005) and am trying to produce a rather tricky report...
I have two tables returned from a SQL query. The first is a master table that has a list of set ID's corresponding to sets of records in the second, and has a record set like so:
+----------------------+
| SetID |
+----------------------+
| 1 |
| 2 |
| 3 |
| ... |
| |
The second table is a list of bjorks, let's call them. It looks like this:
+----------+-------+-----------+-----------
| BjorkID | SetID | BjorkName | ...
+----------+-------+-----------+-----------
| 1 | 1 | Bob |
| 2 | 1 | Jones |
| 3 | 1 | Smith |
| 4 | 2 | Jack |
| 5 | 2 | Daniels |
| 6 | 3 | Moo |
| 7 | 3 | Bean |
| 8 | 3 | Bond |
| 9 | 3 | Jim |
| ... | ... | ... |
| | | |
Now, I need to generate a report that prints off one page for each Set, and each Set's page contains a list of its Bjorks.
Can anyone point me in the right direction to mangle RDLC into doing this? :)
Cheers!
You can accomplish your task with just the second table/data set and parent and detail groups on a table or list.
Parent groups on SetID. Detail groups on BjorkID. Set your page breaks accordingly.
HTH