I am using the following InnoDB tables in mysql to describe records that can have multiple searchtags associated with them:
TABLE records
ID
title
desc
TABLE searchTags
ID
name
TABLE recordSearchTags
recordID
searchTagID
To SELECT records based on arbitrary search input, I have a statement that looks sort of like this:
SELECT
recordSearchTags.recordID
FROM
recordSearchTags
LEFT JOIN searchTags
ON recordSearchTags.searchTagID = searchTags.ID
WHERE
searchTags.name LIKE CONCAT('%','$search1','%') OR
searchTags.name LIKE CONCAT('%','$search2','%') OR
searchTags.name LIKE CONCAT('%','$search3','%') OR
searchTags.name LIKE CONCAT('%','$search4','%');
I'd like to ORDER this resultset, so that rows that match with more search terms are displayed in front of rows that match with fewer search terms.
For example, if a row matches all 4 search terms, it will be top of the list. A row that matches only 2 search terms will be somewhere in the middle. And a row that matches just one search term will be at the end.
Any suggestions on what is the best way to do this?
Thanks!
* Replaced answer, since fulltext isn't an option
Alright, it's not pretty, but you should be able to do something like this:
ORDER BY (searchTags.name LIKE CONCAT('%','$search1','%')
+ searchTags.name LIKE CONCAT('%','$search2','%')
+ searchTags.name LIKE CONCAT('%','$search3','%')
+ searchTags.name LIKE CONCAT('%','$search4','%'))
DESC;
LIKE returns 1 on a match or 0 if there is no match, so you should just be able to add the results together.
This isn't very pretty but one way would be to union the 4 likes in 4 statements like
select ... where searchTags.name LIKE CONCAT('%','$search1','%')
union
select ...
and so on. Wrap that in a:
select recordSearchTags.recordID, count(*) from (<inner unions>)
group by recordSearchTags.recordID
order by count(*)
Related
I've a problem to in building a query for Python SQLite3 to do the following:
Count a word which appears in columns, if word appears more than 1 time count one.
I've attached a picture to illustrate my table format.
I tried this but the result still counts duplicate values with same ID.
"SELECT id, value, count(value) FROM table WHERE type like'%hi%' GROUP BY value ORDER BY COUNT(*)<1 DESC"
The result needs to be like:
Hi all you need can be achieved with GROUP BY clause.
This should help:
SELECT
id
,value
,1 AS cnt
FROM table
GROUP BY id, value
ORDER BY id
What you're looking for is DISTINCT clause or GROUP BY as mentioned by Peter.
for GROUP BY use this syntax:
SELECT
id
,value
,1 AS cnt
FROM table
GROUP BY id, value
for DISTINCT use this one:
SELECT DISTINCT
id
,value
,1 AS cnt
FROM table
I am trying to do a left join on my main table using this code
select distinct VBen.BENF_NO_INDIV_BEN_BANLS as benbanls,
VBen.BENF_COD_SEXE AS Sexe,
VBen.BENF_DAT_NAISS AS DatNaiss,
VBen.BENF_DAT_DECES AS DatDec,
A.date_ch as date_chsld
from PROD.V_FICH_ID_BEN_CM AS VBen
left join (select distinct VAss.BENF_NO_INDIV_BEN_BANLS as benbanls,
vass.BENF_DD_ADMIS_ASSU_MED as date_ch
from Prod.V_ADMIS_ASSU_MED_PLAN_PRIOR_CM as vass ) as A
on VBen.BENF_NO_INDIV_BEN_BANLS =A. benbanls
where Vben.BENF_DAT_NAISS>'2016-04-01' or Vben.BENF_DAT_DECES>'2011-04-01'
The problem is that the query result is a table with of number of rows greater than the main table with the same where 'condition'. I don't understand what I am missing
Thanks for your help
Why is it a problem?
The results simply indicate you have a 1:M (one to many) relationship between VBen:Vass(A)
If you don't have a 1:M relationship and it should be 1:1 then...
you're missing join criteria between the tables.
you should be getting a min/max on your date instead of all dates per benbanls
To better understand and answer we would need to know what VBen and Vass actually represent; but to put simply, you have multiple VASS(A) per VBEN
To illustrate with an example: Think about Order_Header and Order_Line tables...
Order_header contains (order_Number PK)
Order_line contains (Order_Number, Order_Line PK)
An order can have multiple lines, each line could have it's own ship date several items may have gone out on the same shipment/day. where some that were backordered went out on a different day. In this situation, an order would still have multiple lines even though we distinct order_number and shipmentdate in a subquery. I would guess your situation is similar.
so 1 in base table * 2 rows in derived/lines table gives us 2 records
1 < 2 which is the situation you have now; and that to me is perfectly fine and expected if it's a 1:M relationship.
Maybe you need to do a min or max on date instead of a distinct?
If not you're missing join criteria to make a 1:1 relationship
maybe your expectation is just flawed.
The below will give you a 1:1 relationship but I'm not sure it's what you're after.
SELECT distinct VBen.BENF_NO_INDIV_BEN_BANLS as benbanls,
VBen.BENF_COD_SEXE AS Sexe,
VBen.BENF_DAT_NAISS AS DatNaiss,
VBen.BENF_DAT_DECES AS DatDec,
A.date_ch as date_chsld
FROM PROD.V_FICH_ID_BEN_CM AS VBen
LEFT JOIN (SELECT VAss.BENF_NO_INDIV_BEN_BANLS as benbanls,
Max(vass.BENF_DD_ADMIS_ASSU_MED) as date_ch
FROM Prod.V_ADMIS_ASSU_MED_PLAN_PRIOR_CM as vass
GROUP BY VAss.BENF_NO_INDIV_BEN_BANLS) as A
on VBen.BENF_NO_INDIV_BEN_BANLS = A. benbanls
WHERE (Vben.BENF_DAT_NAISS>'2016-04-01'
or Vben.BENF_DAT_DECES>'2011-04-01)
It is likely that there is more than one counterpart in the detail table of a record on the main table.
I try your scenario on my db get a correct result.
In my DB:
select distinct p.PollId as PollId,
p.Title AS Title,
p.InsertDate AS DatDec,
ps.date_ch as date_chsld
from dbo.Poll AS p
left join (select distinct pSt.PollId as pollId,
Max(pSt.InsertDate) as date_ch
from dbo.PollStore as pSt
Group by pSt.PollId ) as ps
on p.PollId =ps.pollId
As Your Query like this :
select distinct VBen.BENF_NO_INDIV_BEN_BANLS as benbanls,
VBen.BENF_COD_SEXE AS Sexe,
VBen.BENF_DAT_NAISS AS DatNaiss,
VBen.BENF_DAT_DECES AS DatDec,
A.date_ch as date_chsld
please try this query
from PROD.V_FICH_ID_BEN_CM AS VBen
left join (select distinct VAss.BENF_NO_INDIV_BEN_BANLS as benbanls,
Max(vass.BENF_DD_ADMIS_ASSU_MED) as date_ch
from Prod.V_ADMIS_ASSU_MED_PLAN_PRIOR_CM Group by VAss.BENF_NO_INDIV_BEN_BANLS as vass ) as A
on VBen.BENF_NO_INDIV_BEN_BANLS =A. benbanls
where Vben.BENF_DAT_NAISS>'2016-04-01' or Vben.BENF_DAT_DECES>'2011-04-01'
Currently I´m doing this (get pagination and count), in Informix:
select a.*, b.total from (select skip 0 first 10 * from TABLE) a,(select count(*) total from TABLE) b
The problem is that I´m repeating the same pattern - I get the first ten results from all and then I count all the results.
I want to make something like this:
select *, count(*) from TABLE:
so I can make my query much faster. It is possible?
I want to retrieve data of 'Match' and 'Average' columns from the following table if '2'
exists using LIKE.
I have tried by writing the following query but it failed.
SELECT * FROM batsman_profile
WHERE (Match LIKE '%2%') AND (Average LIKE '%2%');
Can anyone help me how to retrieve data as I want.
In order to treat these numbers as a String you should use function CONVERT(varchar(10), field_name) like this:
SELECT *
FROM batsman_profile
WHERE (CONVERT(varchar(10), Match) LIKE '%2%')
AND
(CONVERT(varchar(10), Average) LIKE '%2%');
I have predefined item combination (for example brand1|brand2|brand3 etc) in the table.
i like to collect brands and check against with predefined table data.
For example i collected brand1|brand2|brand3 then i can do get some value form that predefined table(it meets the condition).
How can i check?
brands would be unlimited. also brand1|brand2|brand3 of brand1|brand2| exist then returns true.
Okay, taking a wild guess at what you're asking, you have a delimited field with brands in them separated by a | character. You want to return any row that has the right combination of the brands in there, but don't want to return rows with, for example, brand "testify" in them when you search for "test".
You have four search conditions (looking for brand3):
the brand exists by itself: "brand3"
the brand starts the delimited field: "brand3|brand4|brand6"
the brand is in the middle of the field: "brand1|brand3|brand6"
the brand is at the end of the field: "brand1|brand2|brand3"
so, in SQL:
SELECT *
FROM MyTable
WHERE BrandField = 'brand3'
OR BrandField LIKE 'brand3|%'
OR BrandField LIKE '%|brand3|%'
OR BrandField LIKE '%|brand3'
Repeat as required for multiple brands.