I want join 6 tables:
Table A join Table B
Table A join Table C
Table A Join Table D
Table D Join Table E
Table E Join Table F
But I can't run it:
SELECT
A.ID, A.Name, A.SName,
B.tel, B.status,
C.ComCode, C.Comdes,
D.Type,
E.Des, E.AreaDes,
F.AreaID
FROM
((((Table A
INNER JOIN
Table B ON A.ID = B.ID)
INNER JOIN
Table C ON A.Concode = C.Comcode)
INNER JOIN
Table D ON A.Type = D.Type)
INNER JOIN
Table E ON D.Des = E.Des)
INNER JOIN
Table F ON E.AreaID = F.AreaID
Get rid of your parentheses and table and it should be vailid SQL, so
SELECT ...
FROM a INNER JOIN b ON a.a = b.a
INNER JOIN c ON b.b = c.a
...
Try this :
SELECT
A.ID, A.Name, A.SName,
B.tel, B.status,
C.ComCode, C.Comdes,
D.Type,
E.Des, E.AreaDes,
F.AreaID
FROM Table A
INNER JOIN Table B ON A.ID = B.ID
INNER JOIN Table C ON A.Concode = C.Comcode
INNER JOIN Table D ON A.Type = D.Type
INNER JOIN Table E ON D.Des = E.Des
INNER JOIN Table F ON E.AreaID = F.AreaID
It will help if you tell us what you database server is e.g., SQL Server, Oracle, MySQL, etc. When you say, "...I can't run it..." are you getting an error? If so, can you share that.
I ditched your parenthesis...
SELECT
A.ID,
A.Name,
A.SName,
B.tel,
B.status,
C.ComCode,
C.Comdes,
D.Type,
E.Des,
E.AreaDes,
F.AreaID
FROM
TableA A INNER JOIN TableB B ON A.ID = B.ID
INNER JOIN TableC C ON A.Concode = C.Comcode
INNER JOIN TableD D ON A.Type = D.Type
INNER JOIN TableE E ON D.Des = E.Des
INNER JOIN TableF F ON E.AreaID = F.AreaID
For clarity, I adjusted your table names (so it was clear what was Table A vs. Table B).
Related
I have two tables Say A and B. A is master table and B is child table, from which I need values as below.
select A.Id, A.Name, B.Path from A,B where A.Id=B.Id
Now, I want to add column of 3rd table which is child of table 'B', say C i.e. C.File.
The value of C.File will be null if C.SubId=B.SubId is false else will return value when condition becomes true.
This is the exact definition of a left join:
SELECT a.id, b.name, b.path, c.file
FROM a
JOIN b ON a.id = b.id
LEFT JOIN c ON b.subid = c.subid
You need to LEFT JOIN your third table from what I can gather.
SELECT A.Id, A.Name, B.Path, C.file
FROM tableA a
INNER JOIN tableB b ON a.id = b.id
LEFT JOIN tableC c ON b.subid = c.subid
Simply Join all the three tables using INNER JOIN
select A.Id, A.Name, B.Path ,C.File
FROM A
INNER JOIN B
ON A.Id=B.Id
INNER JOIN C
ON C.SubId=B.SubId
table A(a_id)
table B (b_id)
table c(c_id , b_id, a_id);
select a.*, b.* , c*
from c join b
i'm confused from here ???
Try this -
SELECT * FROM A
INNER JOIN C
ON A.a_id = C.a_id
INNER JOIN B
ON B.b_id = C.b_id;
SELECT a.*, b.*, c*
FROM c
LEFT JOIN b USING (b_id)
LEFT JOIN a USING (a_id);
Try this
SELECT A.* from tableA A
LEFT JOIN tableC C ON C.a_id = A.a_id
LEFT JOIN tableB B ON C.b_id = B.b_id
You could use INNER, LEFT, RIGHT, FULL... JOINS in following:
SELECT *
FROM A
LEFT JOIN B ON A.a_id = B.b_id
LEFT JOIN C ON B.b_id = C.c_id
I am having some trouble trying to add 2 more joins to a select. The bellow works for me:
FROM
TABLE1 A
INNER JOIN TABLE2 B ON A.ID = B.ID
LEFT JOIN TABLE3 C ON A.REQUESTED_BY = C.USER_NAME
LEFT JOIN TABLE3 D ON A.COORDINATOR = D.USER_NAME
INNER JOIN TABLE4 E ON A.ID = E.PARENT_ID
INNER JOIN TABLE5 F ON E.ID = F.ID
But I need to get more information, so I tried something like this (added the last 2 rows):
FROM
TABLE1 A
INNER JOIN TABLE2 B ON A.ID = B.ID
LEFT JOIN TABLE3 C ON A.REQUESTED_BY = C.USER_NAME
LEFT JOIN TABLE3 D ON A.COORDINATOR = D.USER_NAME
INNER JOIN TABLE4 E ON A.ID = E.PARENT_ID
INNER JOIN TABLE5 F ON E.ID = F.ID
INNER JOIN TABLE6 G ON A.ID = B.ID
LEFT JOIN TABLE3 H ON G.COORDINATOR = H.USER_NAME
And this isn't working like it should.
Question: How can I add the last two joins to make the select works? Thanks.
You're not actually joining to TABLE6 (G) anywhere. I would think that this join:
INNER JOIN TABLE6 G ON A.ID = B.ID
should be something like this instead:
INNER JOIN TABLE6 G ON A.ID = G.ID
And as a side note, I hope you're using table aliases that are more meaningful than A, B, C, etc. in your real code. ;-)
To be honest I am not sure how to layout this question, but I tried my best.
I am trying to join multiple tables. TableA has got no with TableE and TableF.
Observe the area in query where I tried to highlight with **
when it comes to TableE I joined with TableF which is further below. How to re-write this?
SELECT
a.NAME,b.ID,c.CODE
FROM SCHEMA.TABLEA A
INNER JOIN SCHEMA.TABLEB b
ON A.A_ID = B.B_ID
INNER JOIN SCHEMA.TABLEC C
ON A.A_ID = C.C_ID
LEFT JOIN SCHEMA.TABLED D
ON A.A_ID = D.D_ID
**LEFT JOIN SCHEMA.TABLEE E
ON D.D_ID = F.F_ID
LEFT JOIN SCHEMA.TABLEF F
ON E.E_ID = F.F_ID**
Since you stated that table f is realted to table d and table e is related to table f i think you just need to change the order of join as follow
SELECT
a.NAME,b.ID,c.CODE
FROM SCHEMA.TABLEA A
INNER JOIN SCHEMA.TABLEB b
ON A.A_ID = B.B_ID
INNER JOIN SCHEMA.TABLEC C
ON A.A_ID = C.C_ID
LEFT JOIN SCHEMA.TABLED D
ON A.A_ID = D.D_ID
LEFT JOIN SCHEMA.TABLEF F
ON D.D_ID = F.F_ID
LEFT JOIN SCHEMA.TABLEE E
ON E.E_ID = F.F_ID
i have four tables which are related like this:
TABLE A: 1 to many with TABLE B
TABLE B: 1 to many with TABLE C
TABLE D: many to 1 with TABLE B
I would like to create a result set which contains no duplicates.
SELECT A.f1
A.f2
B.f1
C.f1
D.f1
from A LEFT JOIN (B INNER JOIN D on D.fk_b = B.id) on A.id = B.fk_a
LEFT JOIN C on C.fk_b = B.id
Some but not all records are duplicated. Only the records from TABLE D which have the same FK to TABLE B.
If there are 2 the same D.fk_B fields then i would like to select only the first one. My INNER JOIN would become something like:
B INNER JOIN TOP 1 D on.....
But that's not possible?
Thank you!
Assuming that the structure in question is near the one shown bellow,
The following SELECT statement will show you just the primary keys, briefly giving an idea about what data is being returned.
SELECT
A.id AS `A_id`,
B.id AS `B_id`,
COALESCE(C.id, 0) AS `C_id`,
COALESCE(
(SELECT D.id FROM D WHERE D.fk_b = B.id LIMIT 1), 0
) AS `D_id`
FROM B
INNER JOIN A ON (B.fk_a = A.id)
LEFT JOIN C ON (B.id = C.fk_b);
Now the select you've asked for:
SELECT
A.f1 AS `A_f1`,
A.f2 AS `A_f2`,
B.f1 AS `B_f1`,
COALESCE(C.f1, '-') AS `C_f1`,
COALESCE(
(SELECT D.f1 FROM D WHERE D.fk_b = B.id LIMIT 1), '-'
) AS `D_f1`
FROM B
INNER JOIN A ON (B.fk_a = A.id)
LEFT JOIN C ON (B.id = C.fk_b);
Code above was tested and worked fine on MySQL 5.6
It appears that you have cartesian join.
You could try just putting DISTINCT infront of you column definition or you could so subqueries to link the tables together.
Try
SELECT DISTINCT A.f1
A.f2
B.f1
C.f1
D.f1
from A LEFT JOIN (B INNER JOIN D on D.fk_b = B.id) on A.id = B.fk_a
LEFT JOIN C on C.fk_b = B.id
You can do this:
B INNER JOIN TOP 1 D on.....
Like this
B INNER JOIN (SELECT TOP 1 fields from table) D ON ...
Try this:
SELECT DISTINCT A.f1
A.f2
B.f1
C.f1
D.f1
from A
LEFT JOIN (B INNER JOIN (SELECT DISTINCT fk_b FROM D) D on D.fk_b = B.id)
on A.id = B.fk_a
LEFT JOIN C on C.fk_b = B.id