Okay, I'm using WordPress, but this pertains to the SQL side.
I have a query in which I need to filter out posts using three different categories, but they're all terms in the post.
For example:
In my three categories, I select the following: (Academia,Webdevelopment) (Fulltime,Parttime) (Earlycareer).
Now what I want to do is make sure when I query that the post has AT LEAST ONE of each of those terms.
CORRECT RESULT: A post with tags Academia, Fulltime, Earlycareer
INCORRECT RESULT: A post with tags Academia, Earlycareer (doesn't have fulltime or parttime)
Currently, my query looks something like this:
SELECT * FROM $wpdb->posts WHERE
(
$wpdb->terms.slug IN (list of selected from category 1) AND
$wpdb->terms.slug IN (list of selected from category 2) AND
$wpdb->terms.slug IN (list of selected from category 3)
)
AND $wpdb->term_taxonomy.taxonomy = 'jobtype' AND .......
When using this query, it returns no results when I select across the different categories (that is, I can choose 4 things from category 1 and it has results, but I can't choose anything from category 2 or 3. And vice versa)
I'm not sure if this is something to do with using IN more than once on the same column.
Thanks in advance for any help!
Your query seems to be correct. There is no any limitations in SQL about using IN for the same column miltimple times.
But ensure that you don't have any NULL values in your list of selected from category 1/2/3 queries. Even single NULL value in these lists will give NULL as a result of whole 'WHERE' condition and you will get nothing as a result.
If this won't help then it must be WordPress issue.
Related
I have a table like this one (in a SQL SERVER):
field_name
field_descriptor
tag1
tag2
tag3
tag4
tag5
house
your home
home
house
null
null
null
car
first car
car
wheel
null
null
null
...
...
...
...
...
...
...
I'm developing a WIKI with a searchbar, which should be able to handle a query with more than one string for search. As an user enters a second string (spaced) the query should be able to return results that match restrictively the two strings (if exists) in any column, and so with a three string search.
Easy to do for one string with a simple SELECT with ORs.
Tried in the fronted in JS with libraries like match-sorter but it's heavy with a table with more than 100,000 results and more in the future.
I thought the query should do the heavy work, but maybe there is no simple way doing it.
Thanks in advance!
Tried to do the heavy work with all results in frontend with filtering and other libraries like match-sorter. Works but take several seconds and blocks the front.
Tried to create a simple OR/AND query but the posibilities with 3 search-strings (could be 1, 2 or 3) matching any column to any other possibility is overwhelming.
You can use STRING_SPLIT to get a separate row per search word from the search words string. Then only select rows where all search words have a match.
The query should look like this:
select *
from mytable t
where exists
(
select null
from (select value from string_split(#search, ' ')) search
having min(case when search.value in (t.tag1, t.tag2, t.tag3, t.tag4, t.tag5) then 1 else 0 end) = 1
);
Unfortunately, SQL Server seems to have a flaw (or even a bug) here and reports:
Msg 8124 Level 16 State 1 Line 8
Multiple columns are specified in an aggregated expression containing an outer reference. If an expression being aggregated contains an outer reference, then that outer reference must be the only column referenced in the expression.
Demo: https://dbfiddle.uk/kNL1PVOZ
I don't have more time at hand right now, so you may use this query as a starting point to get the final query.
i'm having trouble creating a query that'll group together responses from multiple rows that share a similar name and count the specific response record in them.
the datatable i currently have looks like this
test_control
values
test
selected
control
selected
test us
not selected
control us
selected
test mom
not selected
control mom
selected
what i'd like, is an output like the below that only counts the number of "selected" responses and groups together the rows that have either "control" or "test" in the name"
test_control
values
test
3
control
1
The query i have below is wrong as it doesn't give me an output of anything. The group by section is where im lost as i'm not sure how to do this. tried to google but couldn't seem to find anything. appreciate any help in advance!!!
SELECT distinct(test_control), values FROM `total_union`
where test_control="%test%" and values="selected"
group by test_control, values
use below
SELECT
REGEXP_EXTRACT(test_control, r'^(TEST|CONTROL) ') AS test_control,
COUNTIF(values = 'selected') AS values
FROM `total_union`
GROUP BY 1
As mentioned by #Mikhail Berlyant, you can use REGEX_EXTRACT to match the expression and COUNTIF to get the count of the total number of matching expressions according to the given condition. Try below code to get the expected output :
Code
SELECT
REGEXP_EXTRACT(test_control, r'^(test|control)') AS test_control,
COUNTIF(values = "selected") AS values
FROM `project.dataset.testvalues`
group by 1
Output
I have a db2 table that store brand names. In each line, we have a supplier ID and a country. So I can use that to filter out the brands.
Now the lines also contain a customer ID and a Group.
Either the customer is filled (and the group NULL), the group is filled (and the customer NULL), or they're both NULL.
What I'm trying to do is this : get all the lines that match this specific supplier and country, but with a special filter on the customer and group.
If I have only lines with NULL in both fields, returns all these lines.
If some lines have the group specified, then return only the lines with that group (and ignore those with a NULL group)
BUT if some lines have the customer specified, then return only the lines with the customer specified and ignore the others (the lines with the group or the lines with NULL NULL)
Is that doable in SQL, specifically DB2, or do I need to get ALL the lines and filter later during processing ? (in that case, PHP)
Since you guys want me to show some code, here's what I came up with, after some research (never used "WITH" before)
https://dbfiddle.uk/?rdbms=db2_11.1&fiddle=e7a54ff6eec8ed4be2594644ba3224bd
EDIT : Finally got it working by myself, dunno if it's the best way to do it though
https://dbfiddle.uk/?rdbms=db2_11.1&fiddle=ce7c99d8a37e3dad90900440127730e4
EDIT 2 : I merged the 3 subqueries into 1 by using CASE, I think it's better, but I'm not sure.
https://dbfiddle.uk/?rdbms=db2_11.1&fiddle=b581532553b5619d9cdc388d54619836
I am using SQL server 2005, querying with Web Developer 2010, and the min function appears to be returning more than one value (for each ID returned, see below). Ideally I would like it to just return the one for each ID.
SELECT Production.WorksOrderOperations.WorksOrderNumber,
MIN(Production.WorksOrderOperations.OperationNumber) AS Expr1,
Production.Resources.ResourceCode,
Production.Resources.ResourceDescription,
Production.WorksOrderExcel_ExcelExport_View.PartNumber,
Production.WorksOrderOperations.PlannedQuantity,
Production.WorksOrderOperations.PlannedSetTime,
Production.WorksOrderOperations.PlannedRunTime
FROM Production.WorksOrderOperations
INNER JOIN Production.Resources
ON Production.WorksOrderOperations.ResourceID = Production.Resources.ResourceID
INNER JOIN Production.WorksOrderExcel_ExcelExport_View
ON Production.WorksOrderOperations.WorksOrderNumber = Production.WorksOrderExcel_ExcelExport_View.WorksOrderNumber
WHERE Production.WorksOrderOperations.WorksOrderNumber IN
( SELECT WorksOrderNumber
FROM Production.WorksOrderExcel_ExcelExport_View AS WorksOrderExcel_ExcelExport_View_1
WHERE (WorksOrderSuffixStatus = 'Proposed'))
AND Production.Resources.ResourceCode IN ('1303', '1604')
GROUP BY Production.WorksOrderOperations.WorksOrderNumber,
Production.Resources.ResourceCode,
Production.Resources.ResourceDescription,
Production.WorksOrderExcel_ExcelExport_View.PartNumber,
Production.WorksOrderOperations.PlannedQuantity,
Production.WorksOrderOperations.PlannedSetTime,
Production.WorksOrderOperations.PlannedRunTime
If you can get your head around it, I am selecting certain columns from multiple tables where the WorksOrderNumber is also contained within a subquery, and numerous other conditions.
Result set looks a little like this, have blurred out irrelevant data.
http://i.stack.imgur.com/5UFIp.png (Wouldn't let me embed image).
The highlighted rows are NOT supposed to be there, I cannot explicitly filter them out, as this result set will be updated daily and it is likely to happen with a different record.
I have tried casting and converting the OperationNumber to numerous other data types, varchar type returns '100' instead of the '30'. Also tried searching search engines, no one seems to have the same problem.
I did not structure the tables (they're horribly normalised), and it is not possible to restructure them.
Any ideas appreciated, many thanks.
The MIN function returns the minimum within the group.
If you want the minimum for each ID you need to get group on just ID.
I assume that by "ID" you are referring to Production.WorksOrderOperations.WorksOrderNumber.
You can add this as a "table" in your SQL:
(SELECT Production.WorksOrderOperations.WorksOrderNumber,
MIN(Production.WorksOrderOperations.OperationNumber)
FROM Production.WorksOrderOperations
GROUP BY Production.WorksOrderOperations.WorksOrderNumber)
I have a Product Class which has a one to many relationship to a Price class.
So a product can have multiple prices.
I need to query the db to get me 10 products which have Price.amount < $2. In this case its to populate a UI with 10 items in a page.
so i writ the following code:
ICriteria criteria = session.CreateCriteria(typeof(Product));
criteria.SetFirstResult(pageNumber);
criteria.SetMaxResults(numberOfItemInPage);
criteria = criteria.CreateCriteria("PriceCollection");
criteria.Add(Restrictions.Le("Amount", new Decimal(2)));
criteria.SetResultTransformer(CriteriaSpecification.DistinctRootEntity);
Instead of getting 10 Product on the list, I'm getting less than that (i.e. 5).
The reason being SetMaxResults(10) return me 10 Products but with duplicates. The duplicates are then removed by SetResultTransformer(DistinctRootEntity).
Can anyone tell me any way for me to get 10 unique Products without increasing SetMaxResults()? I need to use pagenumber as some sort of indexing.
That would be up to the SQL to decide, depending on what happens in the methods that gets the list you need to change the SQL so that it behaves as you like.
But being Distinct, you shouldnt get any duplicates.
It seems your duplicates problem stems from the fact that you are joining two tables and so you can get the same product as many times as you have prices for it.
How about adding 2 extra columns to your product table:
MinimumPrice (numeric(18,2)
MaximumPrice (numeric(18,2)
Whenever your system amends pricing for a product you update these two fields on the product. Now you can write a SQL query like the following:
SELECT TOP 10 * FROM Product
WHERE MinimumPrice > 2.0
And you will not have duplicate products.
Would the order of the statements make a difference? It looks like it's setting the maximum count early, and weeding out duplicates at the end, which applied in that order could end up with less than what you limited it to, consistent with what you described happening.
I would think you would need to effectively get all of the results, then apply the restriction (and possibly a sort?) and weed out the duplicates, and then finally apply your paging or count limit to those to get the first 10, next 10, and so on. So reordering the statements to reflect this logical order might help fix your bug.