I've just (6 months+) started learning all the web languages, mostly within OpenCart's framework. Right now I'm trying to get language fallback to work with database content.
The objective is to check for an empty field in id.title and if so choose the default language_id=1.
The language_id comes from a GET request invoked by the frontend user.
The table description looks like this:
------------------------------------------------------
| information_id | language_id | title | description |
------------------------------------------------------
| 3 | 1 | policy | policy desc |
------------------------------------------------------
| 4 | 1 | about | about desc |
------------------------------------------------------
| 4 | 2 | | |
------------------------------------------------------
| 5 | 1 | terms | terms desc |
------------------------------------------------------
| 6 | 1 | comp | comp desc |
------------------------------------------------------
As you can see language_id=2 has no title nor description (inserted by sql, not oc's admin). In this case I want to get the row with the default language=1.
I've tried using CASE but the results are always empty. The problem I can't find a solution for this is to check the title field next to the requested language_id.
I've also tried to first check the field before doing a SELECT, but no success.
SELECT DISTINCT *
FROM information_description id
WHERE id.information_id = '4'
AND id.language_id = (CASE WHEN id.title = '' THEN '1' ELSE '2' END);
Any help would be appreciated.
Here You have two options. Either do this by subselects or once per save/update walk through all the information descriptions and update the missing languages with the texts from the default ones.
The first solution could be:
SELECT id.information_id, id.language_id, id.description,
CASE WHEN id.title IS NOT NULL /* or CASE WHEN id.title <> '' - depending on the real value in DB when it's empty */
THEN id.title
ELSE (SELECT title FROM information_description WHERE language_id = 1)
AS title
FROM information_description id
WHERE id.language_id = 2
I would call such query only in the case when the language ID differs from the default one. Since this may look like working solution I don't like it simply because it increases the DB effort.
Instead of this I recommend to simply update Your missing data in similar way (this could be done maybe only once per life and you are done):
UPDATE information_description id SET
id.title = (SELECT title FROM information_description WHERE language_id = 1 AND information_id = id.information_id)
WHERE id.language_id <> 1
AND id.title IS NULL
for title and
UPDATE information_description id SET
id.description = (SELECT description FROM information_description WHERE language_id = 1 AND information_id = id.information_id)
WHERE id.language_id <> 1
AND id.description IS NULL
for description fields...
Related
I have a SQL query that I'm building and need to convert a number to a word.
The field is titled Type and the values are 1 or 2. I need to convert the 1 to display as Problem and the 2 to display as Resolution.
How would i go about doing this. I built this as an expression in SQL data tools, but we are going in a different direction and need to add it to the query instead and display the report another way.
Thanks!
I'd recommend you have a second table with your ID/Name combination as a lookup and do a JOIN.
That way, as new types come in, you only have to change the name, and not the code.
Although, the syntax would be
CASE WHEN Type = 1 THEN 'Problem'
WHEN Type = 2 THEN 'Resolution' END
You've essentially built the first portion of a normalized database, you've just haven't completed the second portion. The numbers: 1 and 2, can be foreign keys to a second data table that links to the second table's unique auto-incremented ID field:
+-------+ +----+-------------+
| Type | | ID | Description |
+-------+ +----+-------------+
| 1 | | 1 | Problem |
| 2 | | 2 | Resolution |
| 2 | +----+-------------+
| 1 |
+-------+
Which this schema, you can then query the data like such:
SELECT `table2`.`description`
FROM `table2`
INNER JOIN `table1`
ON `table1`.`type` = `table2`.`id`
WHERE `table1`.`type` = 1
Fiddle: Live Demo
What this does is it allows you to add more IDs and Descriptions to your second data table without having to rewrite a bunch of code.
Try below option, it will work with 2 types only (as in question):
Declare #Type int = 1
select
case #Type when 1 then 'Problem'
else 'Resolution'
end as Result
set #Type = 2
select
case #Type when 1 then 'Problem'
else 'Resolution'
end as Result
I have a table that holds actions against specific accounts, the actions are given a numbered SET of actions and within that SET they get a unique, sequential number. We ran into an issue where somehow one of the unique numbers had been duplicated and would like to check for more examples where this might have happened. The table looks a little like this:
Account | Action Set | Action No | Action Code
--------|------------|-----------|------------
001 | 1 | 1 | GEN
001 | 1 | 2 | PHO
001 | 1 | 3 | RAN
001 | 1 | 3 | GEN
002 | 1 | 1 | GEN
002 | 1 | 2 | PHO
002 | 1 | 3 | RAN
I have tried various things I've found through searches on here but can't find anything that looks like it fits my specific circumstances.
For any given account number, I would like to find where within one Action SET the same Action Number is used more than once. I also need to return the full row, not just a count of how many there are.
From the example above, I would expect to see these results, same account, same action set, same action number
Account | Action Set | Action No | Action Code
--------|------------|-----------|------------
001 | 1 | 3 | RAN
001 | 1 | 3 | GEN
I would post what I have tried so far but honestly the extent of the code I have written so far is:
SELECT
TIA
Mark
Based on your description, you can use exists:
select t.*
from t
where exists (select 1
from t t2
where t2.account = t.account and
t2.actionset = t.actionset and
t2.actionno <> t.actionno
);
EDIT:
The above assumes that action numbers are different. Otherwise you can use:
select t.*
from t
where (select count(*)
from t t2
where t2.account = t.account and
t2.actionset = t.actionset
) >= 2;
try this one
Select account,actionset,actioncode,actionno
from table
where (account,actionset)
IN
(
Select account,actionset from table
group by account,actionset
having count(distinct actionno)>1
)
group by account,actionset,actioncode,actionno
Please find my solution for Getting duplicate records from table.
SELECT [ActionSet],ActionCode,[ActionNo]
FROM
(
SELECT *,ROW_NUMBER()OVER(PARTITION by [ActionSet],[ActionNo] ORDER BY
[ActionNo]) as rnk FROM [dbo].[ActionAccount]
) t where t.rnk>1
Thanks .
I have a question concerning MS Access queries involving these tables:
tblMIDProcessMain ={ Process_ID,Process_Title,...}
tblMIDProcessVersion = { ProcessVersion_ID, ProcessVersion_FK_Process, ProcessVersion_VersionNo, ProcessVersion_FK_Status, ...}
tblMIDProcessVersionStatus = { ProcessVersionStatus_ID,ProcessVersionStatus_Value }
The tables store different versions of a process description. The "ProcessVersion_VersionNo" field contains an integer providing the version number. Now I would like to get for each process the highest version number thus the current version. If I do the following it kind of works:
SELECT tblMIDProcessMain.Process_Titel
, Max(tblMIDProcessVersion.ProcessVersion_VersionNo) AS CurrentVersion
FROM tblMIDProcessMain
INNER JOIN tblMIDProcessVersion
ON tblMIDProcessMain.Process_ID = tblMIDProcessVersion.ProcessVersion_FK_Process
GROUP BY tblMIDProcessMain.Process_Titel;
The query returns a recordset with each existing process_title and the respective max number of the version field. But as soon as I add other fields like "ProcessVersion_FK_Status" in the Select statement the query stops working.
Any help would be appreciated. Thanks in advance.
Jon
Edit:
To clarify things a little I added a simplified example
Parent-Table:
Process_ID | Process_Title
----------------------------------
1 | "MyProcess"
2 | "YourProcess"
Child-Table:
Version_ID | Version_FK_ProcessID | Version_No | Version_Status
---------------------------------------------------------------------------
1 | 1 | 1 | "New"
2 | 2 | 1 | "Discarded"
3 | 2 | 2 | "Reviewed"
4 | 2 | 3 | "Released"
Intended Result:
Title | Max_Version_No | Status
--------------------------------------------------------
MyProcess | 1 | "New"
YourProcess | 3 | "Released"
Given the example tables you updated your post with, this should work:
select process_title as Title
, max_version.max_version_no
, c.version_status as status
from (parenttable p
inner join (select max(version_id) as max_version_no, version_fk_process_id from childtable group by version_fk_process_id) max_version
on p.process_id = max_version.version_fk_process_id)
inner join childtable c
on max_version.max_version_no = c.version_id and max_version.version_fk_process_id = c.version_fk_process_id
I assume you are adding the new field to the 'Group By" clause? If not, then you either must include in the 'Group By', or you must use one of the operators like "Max" or "First" etc.
I have an image summary table [summary] that will serve as a reporting table in the near future. There is a reference table [views] and a third table that the image team populates [TeamImage]. The summary table has 1 row per part number (table has distinct part numbers) and many columns of image views (TOP, BOT, FRO, BAC, etc.). The [views] table lists each of these views with an id field, which is an IDENTITY field. The [TeamImage] table contains part numbers and views (part number field is not unique as the part numbers will be listed multiple times as they have image views).
Example:
TABLE [summary]
Part_Number | TOP | BOT | FRO | BAC |
12345 | | | | |
67890 | | | | |
TABLE [views]
id | View |
1 | TOP |
2 | BOT |
3 | FRO |
4 | BAC |
TABLE [TeamImage]
PartNum | View |
12345 | TOP |
12345 | BOT |
12345 | FRO |
12345 | BAC |
67890 | FRO |
67890 | BAC |
Here's what I need in the end:
TABLE [summary]
Part_Number | TOP | BOT | FRO | BAC |
12345 | 1 | 1 | 1 | 1 |
67890 | | | 1 | 1 |
I could run several update queries but I have 27 views and about 2 million part numbers. I was hoping I could run something like below, even though I know I cannot use a variable as the column name:
DECLARE #id int = (SELECT max(id) FROM [views]), #ViewType nvarchar(3);
WHILE #id IS NOT NULL
BEGIN
SELECT #ViewType = (SELECT [View] FROM [views] WHERE id = #id);
UPDATE a
SET a.[#ViewType] = '1'
FROM [summary] a
INNER JOIN [TeamImage] b
AND a.[Part_Number] = b.[PartNum]
WHERE b.[View] = #ViewType;
SELECT #id = max(id) FROM [views] WHERE id < #id;
END;
Basically, I was hoping to use a variable to grab the different views from the [views] table (id = 27 down to id=1...could have counted up but doesn't matter) and populate the corresponding field in the [summary] table.
I know the SET a.[#ViewType] = '1' won't work, and a colleague of mine mentioned using VB but didn't know if that really was the most efficient option. I understand that I could use a PIVOT on the [TeamImage] table, but I'm not sure that will allow me to update my [summary] table (which has many more fields in it than just the image views). It still seems I need something that will effectively loop through update queries. I could write 4 update queries, one for each view (although my real table has 27 views), but I need something more dynamic in case we add views in the future.
To create your final summary, you can do via a simple pivot, yet this is fixed to the few codes you've done... but I know SQL does have a PIVOT command, but not directly familiar enough with it.
select
TA.PartNum,
max( case when TA.TeamImage = 'TOP' then '1' else ' ' end ) as TOPview,
max( case when TA.TeamImage = 'BOT' then '1' else ' ' end ) as BOTview,
max( case when TA.TeamImage = 'FRO' then '1' else ' ' end ) as FROview,
max( case when TA.TeamImage = 'BAC' then '1' else ' ' end ) as BACview
from
TeamImage TA
group by
TA.PartNum
Obviously simple to expand, but you can also look into the "PIVOT" syntax
I asked the question a little better here: SQL output as variable in VB.net and was able to receive an answer that worked for what I was looking for. I appreciate DRapp providing a solution through PIVOT, but I think the VB way will be easier for me moving forward. In short, using VB with ExecuteScalar and ExecuteNonQuery, I was able to re-write my query using the variables I had above.
I am representing itemsets in SQL (SQLite, if relevant). My tables look like this:
ITEMS table:
| ItemId | Name |
| 1 | Ginseng |
| 2 | Honey |
| 3 | Garlic |
ITEMSETS:
| ItemSetId | Name |
| ... | ... |
| 7 | GinsengHoney |
| 8 | HoneyGarlicGinseng |
| 9 | Garlic |
ITEMSETS2ITEMS
| ItemsetId | ItemId |
| ... | .... |
| 7 | 1 |
| 7 | 2 |
| 8 | 2 |
| 8 | 1 |
| 8 | 3 |
As you can see, an Itemset may contain several Items, and this relationship is detailed in the Itemset2Items table.
How can I check whether a new itemset is already in the table, and if so, find its ID?
For instance, I want to check whether "Ginseng, Garlic, Honey" is an existing itemset. The desired answer would be "Yes", because there exists a single ItemsetId which contains exactly these three IDs. Note that the set is unordered: a query for "Honey, Garlic, Ginseng" should behave identically.
How can I do this?
I would recommend that you start by placing the item sets that you want to check into a table, with one row per item.
The question is now about the overlap of this "proposed" item set to other itemsets. The following query provides the answer:
select itemsetid,
from (select coalesce(ps.itemid, is2i.itemid) as itemid, is2i.itemsetid,
max(case when ps.itemid is not null then 1 else 0 end) as inProposed,
max(case when is2i.itemid is not null then 1 else 0 end) as inItemset
from ProposedSet ps full outer join
ItemSets2items is2i
on ps.itemid = is2i.itemid
group by coalesce(ps.itemid, is2i.itemid), is2i.itemsetid
) t
group by itemsetid
having min(inProposed) = 1 and min(inItemSet) = 1
This joins all the proposed items with all the itemsets. It then groups by the items in each item set, giving a flag as to whether the item is in the set. Finally, it checks that all items in an item set are in both.
Sounds like you need to find an ItemSet that:
contains all the Items in your wanted list
doesn't contain any other Items
This example will return the ID of such an itemset if it exists.
Note: this solution is for MySQL, but it should work in SQLite once you change #variables into something SQLite understands, e.g. bind variables.
-- these are the IDs of the items in the new itemset
-- if you add/remove some, make sure to change the IN clauses below
set #id1 = 1;
set #id2 = 2;
-- this is the count of items listed above
set #cnt = 2;
SELECT S.ItemSetId FROM ItemSets S
INNER JOIN
(SELECT ItemsetId, COUNT(*) as C FROM ItemSets2Items
WHERE ItemId IN (#id1, #id2)
GROUP BY ItemsetId
HAVING COUNT(*) = #cnt
) I -- included ingredients
ON I.ItemsetId = S.ItemSetId
LEFT JOIN
(SELECT ItemsetId, COUNT(*) as C FROM ItemSets2Items
WHERE ItemId NOT IN (#id1, #id2)
GROUP BY ItemsetId
) A -- additional ingredients
ON A.ItemsetId = S.ItemSetId
WHERE A.C IS NULL
See fiddle for MySQL.