I have to display ten columns values from diffrent ten
tables.
how many joins are require?
Answers were Sorted based on User's Feedback
Answer / praveen mehta
There are 2 possible answers
1. No joins required
Ex:
SELECT Col1 As Col from Tab1
Union
SELECT Col2 As Col from Tab2
Union
SELECT Col1 As Col from Tab3
...
2. 9 Joins Required
Ex:
SELECT
t1.Col1,
t2.Col2,
....
FROM Tab1 t1
inner join Tab2 t2 on t1.Col1=t2.Col2
inner join Tab3 t3 on t1.Col1=t3.Col2
....
Is This Answer Correct ? | 44 Yes | 2 No |
Answer / anil sharma
If there is no relation between tables then no joins.And if
there relation and you want to fetch related data then 9
join required if parent table has all foreign key of their
tables.
Is This Answer Correct ? | 29 Yes | 2 No |
Answer / nitin
there are 3 answeres
1. No joins are required if do not want to display related
data
2. 9 joins are requred if all tables are related
3. no joins reuquired we can use union if condition is
like following
select cola from a
union
select colb from b
union
select colc from c
.
.
.
like wise ten statements
Is This Answer Correct ? | 8 Yes | 2 No |
Answer / b.kumar
--MS SQL SERVER
WE CAN DISPLAY RECORDS BY USING 9 JOINS
SELECT TBL1.COLUMN1,TBL2.COLUMN2,---------,TBL10.COLUMN10
FROM TBL1 INNER JOIN TBL2 ON TBL1.ID=TBL2.ID
INNER JOIN TBL3 ON TBL1.ID=TBL3.ID
----
----
----
INNER JOIN TBL10 ON TBL1.ID=TBL10.ID
----------------------------------------
--WE CAN ALSO DISPLAY THE RECORDS WITH OUT USE JOINS
SELECT TBL1.COLUMN1,TBL2.COLUMN2,---------,TBL10.COLUMN10
FROM TBL1,TBLE2,--------,TBL10
WHERE TBL1.ID=TBL2.ID OR TBL1.ID=TBL3.ID OR
----
----
----
TBL1.ID=TBL10.ID
--WE MUST USE WHERE CLAUSE OTHER WISE WE GET Cartesian product.
--------------------------------------------------
WE CAN'T JOIN DIFFERENT TABLES OF COLUMNS BY USING UNION
BECAUSE UNION COMBINES THE TWO OR MORE RESULT SETS
(IT MEANS ROWS)
DIFFERENCE BETWEEN JOIN & UNION
-- JOIN COMBINES TWO OR MORE THE COLUMNS
-- UNION COMBINES TWO OR MORE ROWS
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / ask
Select column1, column2, ...., column10 from table1,
table2, ..., table10
Is This Answer Correct ? | 2 Yes | 3 No |
Answer / sumesh.s.g
n-1 JOINS
that is 10-1 Join
Or using UNION or UNION all but its not a join
However we will get value from Tables
Is This Answer Correct ? | 2 Yes | 3 No |
Answer / sathish
The 10 tables can be joined as,
select table1.columnname,table2.columnname,.....
from table1,table2,.......
It displays 10 fields from 10 different tables.
Is This Answer Correct ? | 3 Yes | 5 No |
Answer / sanjay kumar dinda
It will be 9( no. of tables -1)...
As we can join two tables by using two tables ...
Is This Answer Correct ? | 0 Yes | 2 No |
Answer / sachin
i Think there is formula 2n-1
where n is the number of table
so, answer will be 2*10-1=19
Is This Answer Correct ? | 2 Yes | 13 No |
How to concatenate two binary strings together?
Describe the functionalities that views support.
What the different topologies in which replication can be configured?
What is table join?
if you encounter this kind of an error message, what you need to look into to solve this problem? : Sql server database administration
Can binary strings be converted into numeric or float data types?
Explain the use of keyword with encryption. Create a store procedure with encryption?
What are the advantages of user-defined functions over stored procedures in sql server?
What does it mean to normalize a database and why would you do it?
What is log shipping? Can we do logshipping with SQL Server 7.0 - Logshipping is a new feature of SQL Server 2000. We should have two SQL Server - Enterprise Editions. From Enterprise Manager we can configure the logshipping. In logshipping the transactional log file from one server is automatically updated into the backup database on the other server. If one server fails, the other server will have the same db and we can use this as the DR (disaster recovery) plan.
What is 2nf example?
Can you explain what are various ways to enhance the ssrs report?