I have a counselling appointment website. Currently I list clients in one table, but also have couples listed by id in a second table for when they book a couples session. ie:
client
id_no first last
564 John Smith
983 Mary Jones
999 Mark Fields
882 Joan Hancock
couple
id_no client1 client2
623 564 983
555 999 882
I would like to write a single select statement, using aliases, which will list out couples on a single line. Up until now, I have been doing a simple join then cleaning up the result using php after running the query, but would like to clean this up in sql so that I get a result like the following
id_no first_1 last_1 first_2 last_2
623 John Smith Mary Jones
555 Mark Fields Joan Hancock
I suspect that sub queries might be involved, but can't for the life of me wrangle them to get this result.
Update
I just tried the following:
SELECT id_no,first_1,last_1,first_2,last_2
FROM ( SELECT a.id_no AS id_no, b.first AS first_1,b.last AS last_1
FROM couple AS a, client AS b WHERE a.client1=b.id_no ) c1
JOIN ( SELECT a.id_no AS id_no, b.first AS first_2,b.last AS last_2
FROM couple AS a, client AS b WHERE a.client2=b.id_no ) c2 ON
(c1.id_no=c2.id_no)
And am getting a message that "Column 'id_no' in field list is ambiguous". Not sure if I am on the right track
You are getting the exception because you did not specified the table alias to id_no as this column belongs to both tables, so SQL is not sure which column to return, so it will throw ambiguous column error.
Also you don't have to use sub queries, you just need to join client table twice with couple table, one for client1 and other one for client2 like below
Select cp.id_no,
cl1.first as first_1,
cl1.last as last_1,
cl2.first as first_2,
cl2.last as last_2
From couple cp
inner join client cl1 on cl1.id_no = cp.client1
inner join client cl2 on cl2.id_no = cp.client2
Related
I've reviewed multiple Q&A involving TOP 1 and CROSS APPLY (including the very informative 2043259), but I still can't figure out how to solve my issue. If I had a single join I'd be fine, but fitting TOP 1 into the middle of a chain of joins has stumped me.
I have four tables and one of the tables contains multiple matches when joining due to a previous bug (since fixed) that created new records in the table instead of updating existing records. In all cases, where there are multiple records, it is the top-most record that I want to use in one of my joins. I don't have access to the table to clean up the extraneous data, so I just have to deal with it.
The purpose of my query is to return a list of all "Buildings" managed by a particular person (user choses a person's name and they get back a list of all buildings managed by that person). My tables are:
Building (a list of all buildings):
BuildingId BuildingName
1 Oak Tree Lane
2 Lighthoue Court
3 Fairview Lane
4 Starview Heights
WebBuildingMapping (mapping of BuidingId from Building table, that is part of an old system, and corresponding WebBuildingId in another piece of software):
BuildingId WebBuildingId
1 201
2 202
3 203
4 204
WebBuildingContacts (list of ContactID for the building manager of each building). This is the table with duplicate values - where I want to choose the TOP 1. In sample data below, there are two references to WebBuidingId = 203 (row 3 & row 5) - I only want to use row 3 data in my join.
Id WebBuildingId ContactId
1 201 1301
2 202 1301
3 203 1303
4 204 1302
5 203 1302
Contacts (list of ContactIds and corresponding property manager Names)
ContactId FullName
1301 John
1302 Mike
1303 Judy
As noted, in the example above, the table WebBuildingContact has two entries for the building with a WebBuidingId = 203 (row 3 and row 5). In my query, I want to select the top one (row 3).
My original query for a list of buildings managed by 'Mike' is:
SELECT BuildingName
FROM Building bu
JOIN WebBuildingMapping wbm ON wbm.BuildingId = bu.BuildingId
JOIN WebBuildingContact wbc ON wbc.WebBuildingId = wbm.WebBuildingId
JOIN Contacts co ON co.ContactId = wbc.ContactId
WHERE co.FullName = 'Mike'
This returns 'Fairview Lane' and 'Starview Heights'; however, Judy manages 'Fairview Lane' (she's the top entry in the WebBuildingContacts table). To modify the query and eliminate row 5 in WebBuildingContacts from the join, I did the following:
SELECT BuildingName
FROM Building bu
JOIN WebBuildingMapping wbm ON wbm.BuildingId = bu.BuildingId
JOIN WebBuildingContact wbc ON wbc.WebBuildingId =
(
SELECT TOP 1 WebBuildingId
FROM WebBuildingContact
WHERE WebBuildingContact.WebBuildingId = wbm.WebBuildingId
)
JOIN Contacts co ON co.ContactId = wbc.ContactId
WHERE co.FullName = 'Mike'
When I try this; however, I get the same result set (ie it returns 'Mike' as manager for 2 buildings). I've also made various attempts to use CROSS APPLY but I just end up with 'The multi-part identifier could not be bound', which is a whole other rabbit hole to go down.
You could try this:
SELECT bu2.BuildingName
FROM building bu2
WHERE bu2.BuildingId IN
(SELECT MAX(bu.BuildingId)
FROM Building bu
JOIN WebBuildingMapping wbm ON wbm.BuildingId = bu.BuildingId
JOIN WebBuildingContact wbc ON wbc.WebBuildingId = wbm.WebBuildingId
JOIN Contacts co ON co.ContactId = wbc.ContactId
WHERE co.FullName = 'Mike'
);
I have two tables in MS Access that have the same Name_ID column, the only problem is that they differ slightly. Name_ID in table 1 looks like this:
Name_ID
Newton, Kate Little
River, Jane Armen
Barker, Bob Jep
Jake, Lee
And in table 2 it looks like this:
Name_ID
NEWTON, KATE L MD
RIVER, JANE A DO MS
BARKER, BOB J. (MD)
JAKE, LEE I.
I'm struggling with how to join the tables. I tried doing a join using like, based on Access/SQL Server 2008 Join using Like not working, but it's not working:
Select table1.*, table2.col from table1
left join
table2
on table1.Name_ID like '*' & table2.Name_ID & '*';
I also tried:
Select table1.*, table2.col from table1
left join
table2
on instr(table1.Name_ID, table2.Name_ID) > 0;
Both queries execute, but return blank columns. Any idea why it's not working, or a better way?
Both queries are looking for a full name string within another full name string. How would you expect Newton, Kate Little to match to *NEWTON, KATE L MD*? And for the second query, NEWTON, KATE L MD is not within Newton, Kate Little.
Probably best can do is extract last name part and match on that. Assumes names are not repeated and not multiple people with same last name and always last name followed by a comma.
SELECT Table1.Name_ID, Table2.Name_ID
FROM Table1 LEFT JOIN Table2
ON Table1.Name_ID LIKE Left(Table2.Name_ID, InStr(Table2.Name_ID,",")) & "*";
please forgive me if my jargon is off. I'm still learning!
I just started using Teradata, and to be honest has been a lot of fun. however, I have hit a road block that has stumped me for a while.
I successfully selected a table from a database that looks like:
ID service date name
1 service1 1/5/15 john
2 service2 1/7/15 steve
3 service3 1/8/15 lola
4 service4 1/3/15 joan
5 service5 1/5/15 fred
6 service3 1/3/15 joan
7 service5 1/8/15 oscar
Now I want to search the data base again to find any duplicate IDs (example: to see if service service1 with date 1/5/15 with name john exists on another row with a different ID.)
At first, I did something like this:
SELECT ID, service, date, name
FROM table
WHERE table.service = ANY(service1, service2, service3, service4, service5, service3, service5)
AND table.date = ANY('1/5/15', '1/7/15, '1/8/15', '1/3/15', '1/5/15', '1/3/15', '1/8/15')
AND table.name = ANY('john', 'steve', 'lola', 'joan', 'fred', 'joan', 'oscar');
But this is giving me more rows than I wanted.
example:
ID service date name
92 service3 1/8/15 steve
is of no use to me since I am looking for IDs that have the same combination of service, date, and name as of any of the other IDs in the above table.
something like this would be favorable:
ID service date name
609 service3 1/8/15 lola
since it matches than of ID 3.
I was curious to see if it were possible to treat the three columns (service, date, name) as a vector and maybe select the rows that match it that way?
ex
......
WHERE (table.service, table.date, table.name) = ANY((service3,1/8/15,lola), (service1, 1/5/15, john), ...etc)
My Teradata is down right now, So I have yet to try the above example. Nevertheless, any thoughts/feedback is greatly appreciated!
The following query may be what you are trying to achieve. This selects IDs for which the combination of service, date, and name appears more than once.
SELECT t1.ID
FROM yourTable t1
INNER JOIN
(
SELECT service, date, name
FROM yourTable
GROUP BY service, date, name
HAVING COUNT(*) > 1
) t2
ON t1.service = t2.service AND
t1.date = t2.date AND
t1.name = t2.name
This is a simple task for a Windowed Aggregate:
SELECT *
FROM tab
QUALIFY
COUNT(*) OVER (PARTITION BY service, date, name) > 1
This counts the number of rows with the same combination of values (like Tim Biegeleisen's Derived Table) but unlike a Standard Aggregate it keeps all rows. The QUALIFY is a nice Teradata syntax extension to avoid a Derived Table.
Don't hardcode values in your query unless you absolutely have to. Instead, take the query you already wrote and join to that.
SELECT dupes.*
FROM (your query) yourquery
JOIN table dupes
ON yourquery.service = dupes.service
AND yourquery.date = dupes.date
AND yourquery.name = dupes.name
Right now I've got a Main table in which I am uploading data. Because the Main table has many different duplicates, I Append various data out of the Main table into other tables such as, username, phone number, and locations in order to keep things optimized. Once I have everything stripped down from the Main table, I then append what's left into a final optimized Main table. Before this happens though, I run a select query joining all the stripped tables with the original Main table in order to connect the IDs from each table, with the correct data. For example:
Original Main Table
--Name---------Number------Due Date-------Location-------Charges Monthly-----Charges Total--
John Smith 111-1111 4/3 Chicago 234.56 500.23
Todd Jones 222-2222 4/3 New York 174.34 323.56
John Smith 111-1111 4/3 Chicago 274.56 670.23
Bill James 333-3333 4/3 Orlando 100.00 100.00
This gets split into 3 tables (name, number, location) and then there is a date table with all the dates for the year:
Name Table Number Table Location Table Due Date Table
--ID---Name------ -ID--Number--------- ---ID---Location---- --Date---
1 John Smith 1 111-1111 1 Chicago 4/1
2 Todd Jones 2 222-2222 2 New York 4/2
3 Bill James 3 333-3333 3 Orlando 4/3
Before The Original table gets stripped, I run a select query that grabs the ID from the 3 new tables, and joins them based on the connection they have with the original Main table.
Select Output
--Name ID----Number ID---Location ID---Due Date--
1 1 1 4/3
2 2 2 4/3
1 1 1 4/3
3 3 3 4/3
My issue comes when I need to introduce a new table that isn't able to be tied into the Original Main Table. I have an inventory table that, much like the original Main table, has duplicates and needs to be optimized. I do this by creating a secondary table that takes all the duplicated devices out and put them in their own table, and then strips the username and number out and puts them into their tables. I would like to add the IDs from this new device table into the select output that I have above. Resulting in:
Select Output
--Name ID----Number ID---Location ID---Due Date--Device ID---
1 1 1 4/3 1
2 2 2 4/3 1
1 1 1 4/3 2
3 3 3 4/3 1
Unlike the previous tables, the device table has no relationship to the originalMain Table, which is what is causing me so much headache. I can't seem to find a way to make this happen...is there anyway to accomplish this?
Any two tables can be joined. A table represents an application relationship. In some versions (not the original) of Entity-Relationship Modelling (notice that the "R" in E-R stands for "(application) relationship"!) a foreign key is sometimes called a "relationship". You do not need other tables or FKs to join any two tables.
Explain, in terms of its column names and the values for those names, exactly when a row should turn up in the result. Maybe you want:
SELECT *
FROM the stripped-and-ID'd version of the Original AS o
JOIN the stripped-and-ID'd version of the Device AS d
USING NameID, NumberID, LocationID and DueDate
Ie
SELECT *
FROM the stripped-and-ID'd version of the Original AS o
JOIN the stripped-and-ID'd version of the Device AS d
ON o.NameID=d.NameId AND o.NumberID=d.NumberID
AND o.LocationID=d.LocationID AND o.DueDateID=d.DueDate.
Suppose p(a,...) is some statement parameterized by a,... .
If o holds the rows where o(NameID,NumberID,LocationID,DueDate) and d holds the rows where d(NameID,NumberID,LocationID,DueDate,DeviceID) then the above holds the rows where o(NameID, NumberID, LocationID, DueDate) AND d(NameID,NumberID,LocationID,DueDate,DeviceID). But you really have not explained what rows you want.
The only way to "join" tables that have no relation is by unioning them together:
select attribute1, attribute2, ... , attributeN
from table1
where <predicate>
union // or union all
select attribute1, attribute2, ... , attributeN
from table2
where <predicate>
the where clauses are obviously optional
EDIT
optionally you could join the tables together by stating ON true which will act like a cross product
I'm not sure if I'm using the correct terminology.
SELECT movies.*, actors.`First Name`, actors.`Last Name`
From movies
Inner Join actors on movies.`actor1` Where movies.`actor1` = actors.`indexActors`;
#Inner Join actors on movies.`actor2` Where movies.`actor2` = actors.`indexActors`;
I have the 2nd line commented out, each one works individually, and I'm wondering how to combine them.
2ndly, when I execute the query, I get the results:
ID Title Runtime Rating Actor1 Actor2 First Name Last Name
1 Se7en 127 R 1 2 Morgan Freeman
2 Bruce Almighty 101 PG-13 1 3 Morgan Freeman
3 Mr. Popper's Penguins 94 PG 3 4 Jim Carrey
4 Superbad 113 R 4 5 Emma Stone
5 Crazy, Stupid, Love. 118 PG-13 4 Null Emma Stone
Is there a way to add the results from the 2nd join to the rightmost columns?
Also, is it possible to combine the strings/VARCHARs from First Name and Last Name, and then have that value show up under the corresponding Actor Field?
(aka the field under Actor 1 for row 1 would be "Morgan Freeman" instead of "1")
Thanks.
Your sql is not valid, but you can achieve your goal by joining to the same table twice, with different aliases. This sort of thing
select blah blah blah
from table1 t1 join table2 t2 on t1.field1 = t2.field1
join table2 t2_again on t1.field1 = t2_again.field2
etc
As far as joining first and last names in a single field, most databases have a way to concatenate strings, but they are not all the same. You'll have to specify your db engine.