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The select command is the mechanism for retrieving records from a SQL database. In it's simplest form, this would be FROM a single table, for example - select * from CustomerTable.
When data is needed from multiple tables, each pair of tables has to be linked together using a JOIN. The easiest type of join is an INNER JOIN, which expects the data to be in both tables. For example, if a customer record had a 'STATE' code which looked up against the US States and we want our SELECT to return the State name as well as the customer code, it would look something like this;
SELECT CustomerCode, CustomerName, StateName FROM Customer INNER JOIN State on (State.ID = Customer.StateCode)
What else can I help you with?
Join query in sql server 2005?
Join query are basically of three types : 1) Cross Join -- That is use to retrieve data from two tables on a condition (optional), there we get m*n no. of records(m is no of rec in first table and n is the no. of records in another table) 2) Inner Join : we use this join to retrieve values from two tables that satisfies given matching condition : as :: select Product_Category from Product_Detail INNER JOIN Product_Scenerio ON Product_Detail.Product_Id = Product_Detail.Product_Id. Product_Scenerio . 3) Outer Join : this is used in three way: a) Left Outer Join -- it is used to retrieve records from both tables that satisfies given condition including all records from left(First) table whether it do not satisfy condition ...try it practically ** related columns in right table has NULL values in records b) Right Outer Join :: It is used when we want to fetch all records from right(second) table whether that do not match with condition specified with JOIN . ** related columns in right table has NULL values in records c) Full Outer Join :: It is combination of Inner join + left Outer join + right Outer join .Here we get all records from both tables that do not match condition .
How do you create stored procedure?
--Takes three arguments, the last one is optional CREATE PROCEDURE sp1 (@AuthorId int, @DateFrom DateTime, @DateTo DateTime = NULL) AS BEGIN --strip any time portion from the date passed in SELECT @DateFrom = Convert(datetime,convert(char(10),@DateFrom,101)) --if no 'dateto' provided, then default to 23 hours, 59 minutes and 59 seconds --this is because dates are stored by default as 00:00:00, and --we only want to get data for one day IF @DateTo IS NULL BEGIN SET @DateTo = DATEADD ( second , -1, @DateFrom + 1 ) END SELECT a.Name, a.Body, t.Description, u.Name FROM Article a INNER JOIN Topic t on a.TopicId = t.Id LEFT OUTER JOIN Users u on u.Id = a.AuthorId WHERE a.AuthorId = @AuthorId AND a.CreatedDate >= @DateFrom AND e.CreatedDate <= @DateTo END GO
What is the difference between labor union and professional bodies?
The UNION statement in SQL is used to join to result sets that have the same number and type of columns. The UNION statement by default will eliminate duplicate rows (where all columns are the same). If you know that you will not have this condition, or it is not desired to get a DISTINCT recordset back, then use the UNION ALL statement (this will help with performance also).
Why you join pak army?
Yes
What is the difference between seamless and stainless?
'Seamless' means without a 'seam' (a seam is a join therefore seamless stockings are kitted as a tube rather than being cut out of flat material then joined into a tube by stitching). 'Stainless' means without a 'stain' ( a stain is a discoloration or blemish, thus stainless steel will not rust and and therefore a knife made out of this steel will remain new looking throughout its life while an ordinary knife blade will blacken and rust with age).
What is the difference between join and inner join?
One is inner the other is not... Plum
State the basic difference between Inner join and Left Outer Join?
Inner join is from the inside while left out join is from the outside
What is inner join in sql server 2000?
Inner join refers to the join where records that match the where condition in both tables are only fetched. Ex: SELECT A.field1, A.field2, B.field3, B.field4 FROM Table1 A, Table2 B WHERE A.field1 = B.field3 This is an inner join.
How might one use an Inner Join keyword?
The SQL inner join keyword is used to select every row from a table so long as there is a match between the columns of both the tables. This allows many permutations of listings to be made in specified tables.
How do you join more than 3 tables?
In SQL you just keep adding JOINs; select * from Table1 inner join Table2 on (Table2.key = Table1.Key) inner join Table3 on (Table3.key = Table1.Key) inner join Table4 on (Table4.key = Table1.Key) inner join Table5 on (Table5.key = Table1.Key) inner join Table6 on (Table6.key = Table1.Key) and so on.
Difference between FULL JOIN and INNER JOIN in sql?
An INNER JOIN between two tables means that the joining values have to be present in both tables, while an FULL JOIN means that the values can be in either of the two tables. This is also know as a FULL OUTER JOIN.As an example, imagine a customer table with a code,name and type and an auxiliary table with a type id and type description;select * from Customer1 Record One 0012 Number 2 0013 The third 002Select * from CustomerType001 Type_one003 Another One(you'll notice that the type code '002' is missing).select Customer.Name, Customer.TypeCode, TypeCode.Description from Customer INNER JOIN CustomerType on (CustomerType.Code = Customer.TypeCode)Record One 001Number 2 001(The third record is missing because there wasn't a corresponding value in the CustomerType table for the inner join)select Customer.Name, Customer.TypeCode, TypeCode.Description from Customer FULL JOIN CustomerType on (CustomerType.Code = Customer.TypeCode)Record One 001Number 2 001The third 002(Which works because of the FULL - aka OUTER - JOIN)
Do you have inner join command in oracle?
yes, we do have inner join command in oracle. Inner Join is used to combine related tuples from two relations.It allows to evaluate a join condition between attributes of the relations on which join is undertaken .
What is the difference between JOIN and Subquery?
A join will join two or more tables together by a field related to both tables (ie, relationship of primary and foreign keys). It is typically easy to understand. A subquery statement involves a SELECT statement that selects particular values from a table. The values that the select query selects is dependant upon the subquery. The subquery itself is another SELECT statement.
Which SQL join will be fast. Inner Join or Left Join or Right Join or Self Join?
Left Inner Join will be faaster
What is the default join in Microsoft access?
inner join
What is the most common type of join in SQL?
Inner Join
What does 'the joint type is an Inner Join by default mean?
If you do not explicitly state the type of join (inner, outer, left, right) then the database will handle the query as an inner join query even though you did not specify it as such. All multi-table queries are inner joins unless specified otherwise.
