Inner join returning more rows then exist in tables

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Till today my thoughts about the inner join were it will return the minimum number of rows that exist in tables satisfying a joining condition.

Ex. if table A contains 4 rows and table B contains 7 rows . i was expecting that 4 rows can be the maximum output if they satisfy the joining condition.

I just wrote an sp in which i was creating two temporary tables and was populating them. then i took an inner join of them but returning more rows (In my case 29 rows were returned i was expecting 4) After some search i found this link

which confirms that i can happen but i still wonder what are my options to limit the returned result.

Below is my stored procedure.

ALTER PROCEDURE [dbo].[GetDDFDetailOnSiteCol]
@siteId int,
@colNum int
AS
BEGIN
SET NOCOUNT ON;

create Table #portDetail
(
ddfId int,
portDetail nvarchar(50),
siteId int
)
Insert into #portDetail SELECT  ddf.id,  ddf.portDetail, site.Site_ID  from site
        inner join ddf ON site.Site_ID = ddf.siteCodeID 
        where ddf.siteCodeID = @siteId and ddf.colNo= @colNum
        order by colNo,blockNum,portRowNum,portColNum

create Table #portAllocationDetail
(
assigned_slot nvarchar(50),
siteId int
)
Insert into #portAllocationDetail 
SELECT  dbo.portList.assigned_slot, dbo.site.Site_ID
FROM dbo.portList INNER JOIN
 dbo.site ON dbo.portList.siteCodeID = dbo.site.Site_ID
 where dbo.site.Site_ID = @siteId

--select * from #portAllocationDetail   
Select #portDetail.ddfId,#portDetail.portDetail,#portAllocationDetail.siteId,#portAllocationDetail.assigned_slot FROM #portDetail 
INNER JOIN #portAllocationDetail 
ON
#portDetail.siteId = #portAllocationDetail.siteId
END

An inner join repeats each matching row in TableB for each row in TableA. So if there are 4 rows in TableA, and 7 in TableB, the maximum rowcount is 28.

Example at SQL Fiddle.

Inner join returning more rows then exist in tables, You have duplicate rows in feed_id_types. Run this to find which IDs are duplicated: select types.feed_type_id from feed_id_types types group� For each row in the products table, the query finds a corresponding row in the categories table that has the same categoryid. If there is a match between two rows in both tables, it returns a row that contains columns specified in the SELECT clause i.e., product id, product name and category name; otherwise, it checks the next row in products table to find the matching row in the categories table.

----------inner join means- The INNER JOIN keyword returns rows when there is at least one match in both tables.-----------------

Inner join returning more rows then regular select, select statement with inner join returns more rows than equivalent update? – Learn I have one table in an accounting system that I need to update based on a (table3 does not yet exist, I'm thinking like select into) This isn't� The INNER JOIN selects all rows from both participating tables as long as there is a match between the columns. An SQL INNER JOIN is same as JOIN clause, combining rows from two or more tables. An inner join of A and B gives the result of A intersect B, i.e. the inner part of a Venn diagram intersection.

Inner join results in duplicates too.

Use intersect operator if you want unique common values from both tables.

So, here intersect can even display null value if it is null on both sides.

select statement with inner join returns more rows than equivalent , See more: To get just the 32 rows of table 1 you could use LEFT OUTER JOIN instead When inner joining table1 against table2 as above, returning 3 rows is do is find the SUM of the values for a particular country, then join on that. table2 where exists ( select a.country from table1 a where a.country� An inner join returns a result table for all the rows in a table that have one or more matching rows in the other tables, as specified by the sql-expression. Inner joins can be performed on up to 256 tables in the same query-expression.

duplicate rows occuring when using inner join, This is not true: SQL joins will give you at least as many rows as the join specifies . For example, if you have a left table with 10 rows, you are Note: join duplications occur with every type of join, including inner joins. from the right table in order to return just one result (eg. records with the most recent� Till today my thoughts about the inner join were it will return the minimum number of rows that exist in tables satisfying a joining condition. Ex. if table A contains 4 rows and table B contains 7 rows . i was expecting that 4 rows can be the maximum output if they satisfy the joining condition.

More dangerous subtleties of JOINs in SQL — petralia, Use it to combine columns from two or more tables via a join condition. Use an SQL INNER JOIN when you need to match rows from two tables. Those type of joins, called non equi-joins, are explored later in this post. however, they do exist, and you'll appreciate knowing how to use them when you need to do so. join operator. 03/30/2020; 10 minutes to read +2; In this article. Merge the rows of two tables to form a new table by matching values of the specified columns from each table.

SQL Inner Join to Two or More Tables, SQL provides several types of joins such as inner join, outer joins ( left outer join or left If the corresponding row found, the query returns a row that contains data from both tables. For joining more than two tables, the same logic applied. SQL EXISTS � SQL LIKE � SQL Alias � SQL INNER JOIN � SQL OUTER JOIN � SQL � If it returns no rows, then you don't have any rows in the two tables with the same PostalCode, and thus you will not get any rows when you join them on that column. – Dan Aug 15 '13 at 14:15 2

Comments
  • How do you determine which row(s) from Table B are returned?
  • i write select statements. one still exist commented
  • Then either TableA contains more than 4 rows or TableB contains more than 7 rows.
  • Hmm ok, How can i restrict it to four
  • @shah, we can;t answer your question becasue we have to know what data in the second table you want to kepp and what you don't want to keep. You don't want to randomly select a value from that table so we have to know what business rule you want us to show you how to apply.
  • if possible use the intersect operator in an example with the context of the question
  • select * from portDetail pd,portAllocationDetail pad where pd.site_id = pad.site_id and pd.site_id in (select siteId from portDetail intersect select site_id from portAllocationDetail);