I have a table in DB with various columns, one of them being Name. Suppose the Names in DB are A,B,C,D,E,F.
I wrote a query:
Select * from Table where Name IN (#ENTERED_NAMES#)
(Suppose #ENTERED_NAMES# are the various names entered by USER on GUI)
Now suppose that the user enters in the GUI the following names: A,B,C,Y,Z
Since A,B,C are valid names but Y,Z is not present in DB,
so I want the results of A,B,C as it is, but for Y,Z(invalid values) I want results of name "D" for all invalid values.
So the query should come as
Select * from Table where Name IN (A,B,C,D)
try this
first concat the string as 'A','B','C'
Select * from Table where Name IN ('A','B','C');
Something like this maybe?
-- create a table containing all valid names
create table valid_names (name varchar(20));
insert into valid_names values ('A');
insert into valid_names values ('B');
insert into valid_names values ('C');
commit;
with usernames (name) as (
values ('A'),('B'),('C'),('X'),('Y') -- this is the user input
)
select case
when vn.name is null then 'D'
else un.name
end as name,
case
when vn.name is null then 'invalid'
else 'valid'
end as name_info -- name info is just for the demo!
from usernames un
left join valid_names vn on vn.name = un.name;
returns the following:
NAME | NAME_INFO
-----+----------
A | valid
B | valid
C | valid
D | invalid
D | invalid
I'm not sure this is what you should really want, but it seems to be what you asked for:
If you have a temporary table where you insert your GUI input values, then
SELECT coalesce(t.name,'D')
FROM gui_input g
LEFT JOIN db_table t on g.name = t.name
You would be a bit better off with this:
SELECT g.name, coalesce(t.name,'*invalid*')
FROM gui_input g
LEFT JOIN db_table t on g.name = t.name
or
SELECT g.name, case when t.name is null then '*OK*' else '*invalid*' end
FROM gui_input g
LEFT JOIN db_table t on g.name = t.name
But still, I'm not sure we have quite the right question for what will best suit whatever you are trying to do.
Best thing you can do is to write a "CASE" for all the input values other than the values present in database.
Related
I will like to see the specific fields returns with 0 value when there is no record found.
Below are my SQL queries that I have tried so far.
SELECT Customer, Address, Number of lines, Date
FROM table_name
WHERE Date = '30-5-2022' AND Customer IN (A, B, C)
What it returns is only 1 row as below.
Customer
Address
Number of Lines
Date
A
3
RF
30-5-2022
But what I expected to see is:
Customer
Address
Number of Lines
Date
A
UK
33
30-5-2022
B
0
0
30-5-2022
C
0
0
30-5-2022
The customer B and C has no record on 30-5-2022 but I will still need to see the rows but certain columns can be 0.
Please advise if anything that I have missed out? Thanks a lot!
Try below query:
SELECT A.Customer, ISNULL(B.Address, 0),
ISNULL(B.[Number of lines],0), ISNULL(B.Date, '30-05-2022') Date
FROM
(
SELECT DISTINCT Customer
FROM table_name
) A
LEFT JOIN table_name B
ON A.Customer = B.Customer
AND B.Date = '30-5-2022'
This will output all the customers present in the table. You can filter the customers with WHERE clause in the end of the above query based on your requirement.
dbfiddle Link
Assuming customers are in one table (cust) and other stuff in another table (table_name) and they are connected with an id called custid, you need some sweet, sweet left join action, such as:
SELECT c.Customer, c.Address, isnull([Number of lines],0), d.Date
FROM cust c left join table_name d on c.custid = d.custid and
d.Date = '30-5-2022' where
c.Customer IN ('A', 'B', 'C')
You need to put A, B, C in a table and left-join the main table to it. All other conditions must then go in the ON clause not the WHERE.
You can use a virtual VALUES clause for this
SELECT Customer, Address, Number of lines, Date
FROM (VALUES
('A'),
('B'),
('C')
) v(Customer)
LEFT JOIN table_name tn ON tn.Customer = v.Customer
AND tn.Date = '30-5-2022';
Alternatively you can pass in a Table Valued Parameter, or use a table variable. Don't forget to add a primary key.
DECLARE #tmp TABLE (Customer varchar(100) PRIMARY KEY);
INSERT #tmp(Customer) VALUES
('A'),
('B'),
('C');
SELECT Customer, Address, Number of lines, Date
FROM #tmp v
LEFT JOIN table_name tn ON tn.Customer = v.Customer
AND tn.Date = '30-5-2022';
Currently I'm having the following table structure.
Master table Documents:
ID
Filename
1
document1.pdf
2
document2.pdf
3
document3.pdf
Detail table Keywords:
ID
DocumentID
Keyword
1
1
KeywordA
2
1
KeywordB
3
1
KeywordC
4
2
KeywordB
5
3
KeywordA
6
3
KeywordD
Code to create this:
CREATE TABLE Documents (
ID int IDENTITY(1,1) PRIMARY KEY,
Filename nvarchar(255) NOT NULL
);
CREATE TABLE Keywords (
ID int IDENTITY(1,1) PRIMARY KEY,
DocumentID int NOT NULL,
Keyword nvarchar(255) NOT NULL
);
INSERT INTO Documents(Filename) VALUES
('document1.pdf'), ('document2.pdf'), ('document3.pdf');
INSERT INTO Keywords(DocumentID, Keyword) VALUES
(1, 'KeywordA'),
(1, 'KeywordB'),
(1, 'KeywordC'),
(2, 'KeywordB'),
(3, 'KeywordA'),
(3, 'KeywordD');
SQL Fiddle for this.
Finding with one keyword
I'm looking for a way to get all documents matching a certain keyword.
This could be e.g. written with the following T-SQL query:
SELECT Documents.*
FROM Documents
WHERE Documents.ID IN
(
SELECT Keywords.DocumentID
FROM Keywords
WHERE Keywords.Keyword = 'KeywordA'
)
This works successfully.
Finding with multiple keywords
What I'm currently stuck with is when I want to find all documents that match multiple keyword, combined with logical AND.
E.g. find a document that has three detail records with keyword A, B and C.
I think the following might work, but I don't know whether this performant or elegant at all:
SELECT Documents.*
FROM Documents
WHERE Documents.ID IN
(
SELECT Keywords.DocumentID
FROM Keywords
WHERE
Keywords.Keyword = 'KeywordA' OR
Keywords.Keyword = 'KeywordB'
GROUP BY Keywords.DocumentID HAVING COUNT(*) = 2
)
SQL Fiddle for that.
My question
How to write a (performant) SQL query to find all documents that have multiple keywords associated.
If it is easier, a solution with a constant number of keywords (e.g. 3) would be sufficient.
I hope the following query can help you
SELECT D.ID
FROM Documents D
JOIN Keywords K ON K.DocumentID = D.ID
WHERE K.Keyword IN ('KeywordA', 'KeywordB', 'KeywordC')
GROUP BY D.ID
HAVING COUNT(DISTINCT K.Keyword) = 3
Demo
The technique you are trying to do is called Relational Division With Remainder, in other words: find all groups which contain a particular set of rows.
Your current query is one of the standard ways of doing this, there are others.
If you had the keywords in a table variable or TVP, ...
DECLARE #keywords AS TABLE (Keyword varchar(50));
INSERT #keywords VALUES
('KeywordA'), ('KeywordB'), ('KeywordC');
... you could make it much neater with the following:
SELECT d.*
FROM Documents d
WHERE d.ID IN
(
SELECT k.DocumentID
FROM Keywords k
JOIN #keywords kt ON kt.Keyword = k.Keyword
GROUP BY k.DocumentID
HAVING COUNT(*) = (SELECT COUNT(*) FROM #keywords)
);
Another option:
SELECT d.*
FROM Documents d
WHERE EXISTS (SELECT 1
FROM #keywords kt
LEFT JOIN Keywords k ON kt.Keyword = k.Keyword
AND k.DocumentID = d.ID
HAVING COUNT(*) = COUNT(k.keywords) -- there are no missing matches
);
And another, slightly confusing one:
SELECT d.*
FROM Documents d
WHERE NOT EXISTS (SELECT 1
FROM #keywords kt
WHERE NOT EXISTS (SELECT 1
FROM Keywords k
WHERE k.Keyword = kt.Keyword
AND K.DocumentID = d.ID
)
);
-- For each document, there are no keywords for which there is no match
Please refer attached ER diagram.
I need to write a SQL query to fetch records from 2 main tables (Table A and Table B) based on a condition.
Condition is for a given Application (APP_ID) :
if the Table A Case_Status is True (if Case_Status = '00') then fetch all the Table A details (like First_name, Last_name) along with details from Table B (i.e. Person_name, comments from Table B) corresponding to that application
otherwise just fetch application details from Table A only (First_name, Last_name etc)
Table C is just a master table that stores the status code as 'True' or 'False' in its description Column (Status_Id->00, means True and Status_Id->01 means False).
Please suggest me on this. I want to join both columns and bring data but I can't write the condition correctly.
Thank you
This is a bit of a hack...
select a.app_id
, a.case_status
, a.first_name
, a.last_name
, b.description
, b.person_name
, b.comments
from tableA a
left join tableB b
on a.app_id = b.app_id
and a.case_status = '00'
... but it will return all the values in tableA, plus matching values from tableB when the status is correct.
My question is can we join a table A to resultant table of inner join of table A and B without using subquery, CTE or temp tables ?
I am using SQL Server.
I will explain the situation with an example
The are two tables GoaLScorers and GoalScoredDetails.
GoaLScorers
gid Name
-----------
1 A
2 B
3 A
GoalScoredDetails
DetailId gid stadium goals Cards
---------------------------------------------
1 1 X 2 1
2 2 Y 5 2
3 3 Y 2 1
The result I am expecting is if I select a stadium 'X' (or 'Y')
I should get name of all who may or may not have scored there, also aggregate total number of goals,total cards.
Null value is acceptable for names if no goals or no cards.
I can get the result I am expecting with the below query
SELECT
gs.name,
SUM(goal) as TotalGoals,
SUM(cards) as TotalCards
FROM
(SELECT
gid, stadium, goal, cards
FROM
GoalScoredDetails
WHERE
stadium = 'Y') AS vtable
RIGHT OUTER JOIN
GoalScorers AS gs ON vtable.gid = gs.gid
GROUP BY
gs.name
My question is can we get the above result without using a subquery or CTE or temp table ?
Basically what we need to do is OUTER JOIN GoalScorers to resultant virtual table of INNER JOIN OF GoalScorers and GoalScoredDetails.
But I am always faced with ambiguous column name error as "gid" column is present in GoalScorers and also in resultant table. Error persists even if I try to use alias for column names.
I have created a sql fiddle for this her: http://sqlfiddle.com/#!3/40162/8
SELECT gs.name, SUM(gsd.goal) AS totalGoals, SUM(gsd.cards) AS totalCards
FROM GoalScorers gs
LEFT JOIN GoalScoredDetails gsd ON gsd.gid = gs.gid AND
gsd.Stadium = 'Y'
GROUP BY gs.name;
IOW, you could push your where criteria onto joining expression.
The error Ambiguous column name 'ColumnName' occurs when SQL Server encounters two or more columns with the same and it hasn't been told which to use. You can avoid the error by prefixing your column names with either the full table name, or an alias if provided. For the examples below use the following data:
Sample Data
DECLARE #GoalScorers TABLE
(
gid INT,
Name VARCHAR(1)
)
;
DECLARE #GoalScoredDetails TABLE
(
DetailId INT,
gid INT,
stadium VARCHAR(1),
goals INT,
Cards INT
)
;
INSERT INTO #GoalScorers
(
gid,
Name
)
VALUES
(1, 'A'),
(2, 'B'),
(3, 'A')
;
INSERT INTO #GoalScoredDetails
(
DetailId,
gid,
stadium,
goals,
Cards
)
VALUES
(1, 1, 'x', 2, 1),
(2, 2, 'y', 5, 2),
(3, 3, 'y', 2, 1)
;
In this first example we recieve the error. Why? Because there is more than one column called gid it cannot tell which to use.
Failed Example
SELECT
gid
FROM
#GoalScoredDetails AS gsd
RIGHT OUTER JOIN #GoalScorers as gs ON gs.gid = gsd.gid
;
This example works because we explicitly tell SQL which gid to return:
Working Example
SELECT
gs.gid
FROM
#GoalScoredDetails AS gsd
RIGHT OUTER JOIN #GoalScorers as gs ON gs.gid = gsd.gid
;
You can, of course, return both:
Example
SELECT
gs.gid,
gsd.gid
FROM
#GoalScoredDetails AS gsd
RIGHT OUTER JOIN #GoalScorers as gs ON gs.gid = gsd.gid
;
In multi table queries I would always recommend prefixing every column name with a table/alias name. This makes the query easier to follow, and reduces the likelihood of this sort of error.
I asked a question earlier, but I wasn't really able to explain myself clearly.
I made a graphic to hopefully help explain what I'm trying to do.
I have two separate tables inside the same database. One table called 'Consumers' with about 200 fields including one called 'METER_NUMBERS*'. And then one other table called 'Customer_Info' with about 30 fields including one called 'Meter'. These two meter fields are what the join or whatever method would be based on. The problem is that not all the meter numbers in the two tables match and some are NULL values and some are a value of 0 in both tables.
I want to join the information for the records that have matching meter numbers between the two tables, but also keep the NULL and 0 values as their own records. There are NULL and 0 values in both tables but I don't want them to join together.
There are also a few duplicate field names, like Location shown in the graphic. If it's easier to fix these duplicate field names manually I can do that, but it'd be cool to be able to do it programmatically.
The key is that I need the result in a NEW table!
This process will be a one time thing, not something I would do often.
Hopefully, I explained this clearly and if anyone can help me out that'd be awesome!
If any more information is needed, please let me know.
Thanks.
INSERT INTO new_table
SELECT * FROM
(SELECT a.*, b.* FROM Consumers a
INNER JOIN CustomerInfo b ON a.METER_NUMBER = b.METER and a.Location = b.Location
WHERE a.METER_NUMBER IS NOT NULL AND a.METER_NUMBER <> 0
UNION ALL
SELECT a.*, NULL as Meter, NULL as CustomerInfo_Location, NULL as Field2, NULL as Field3
FROM Consumers a
WHERE a.METER_NUMBER IS NULL OR a.METER_NUMBER = 0
UNION ALL
SELECT NULL as METER_NUMBER, NULL as Location, NULL as Field4, NULL as Field5, b.*
FROM CustomerInfo b
WHERE b.METER IS NULL OR b.METER = 0) c
I know to create a new table from other table you can use the following snip:
CREATE TABLE New_table
AS (SELECT customers.Meter_number, customers_info.Meter_number, ...
FROM customers, customers_info
WHERE customers.Meter_number = customers_info.Meter_number
OR customers.Meter_number IS NULL OR customers_info.Meter_number = 0);
I didn't test it out, but you should be able to do something with that.
I guess full outer join is what you need.
Create table #consumers (
meter_number int,
location varchar(50),
field4 varchar(50),
field5 varchar(50)
)
Create table #Customer_info (
meter int,
location varchar(50),
field1 varchar(50),
field2 varchar(50)
)
Insert into #consumers(meter_number ,location , field4 , field5 )
values (1234,'Dallas','a','1')
,(null, 'Denver','b','2')
,(5678,'Houston','c','3')
,(null,'Omaha','d','4')
,(0,'Portland','e','5')
,(2222,'Sacramento','f','6')
Insert into #Customer_info(meter , location )
values (1234,'Dallas')
,(null, 'Kansas')
,(5678,'Houston')
,(Null,'Denver')
,(0,'Boston')
,(4444,'NY')
Select c.*
,i.*
From #consumers c
full outer join #Customer_info i on c.meter_number=i.meter
and c.location=i.location
select * into New_Table From (select METER_NUMBER,Consumers.Location AS Location,Field4,Field5,Meter,Customer_Info.Location As Customer_Info_Location,Field2,Field3 From Consumers full outer Join Customer_Info on Consumers.METER_NUMBER=Customer_Info.Meter And Consumers.Location=Customer_Info.Location) AS t