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2. What is a SQL JOIN, and what are the different types?

   stackoverflow.com/questions/17946221

   1. Equi JOIN : For whatever JOIN type (INNER, OUTER, etc), if we use ONLY the equality operator (=), then we say that the JOIN is an EQUI JOIN. 2. Theta JOIN : This is same as EQUI JOIN but it allows all other operators like >, <, >= etc. Many consider both EQUI JOIN and Theta JOIN similar to INNER, OUTER etc JOIN s.

3. SQL JOIN: what is the difference between WHERE clause and ON...

   stackoverflow.com/questions/354070

   It is the same both 'on' or 'where' on an inner join as long as your server can get it: select * from a inner join b on a.c = b.c. and. select * from a inner join b where a.c = b.c. The 'where' option not all interpreters know so maybe should be avoided. And of course the 'on' clause is clearer.

4. SQL Server Left Join With 'Or' Operator - Stack Overflow

   stackoverflow.com/questions/19725014

   Given how little of the query is being exposed; a very rough rule of thumb is to replace an Or with a Union to avoid table scanning. Select.. LEFT JOIN Child c ON c.ParentAId = a.ParentAId. union. Select.. left Join Child c ON c.ParentBId = b.ParentBId. answered Nov 1, 2013 at 10:41. u07ch. 13.6k 5 43 48.

5. SQL join syntax, when do you use "AS"? - Stack Overflow

   stackoverflow.com/questions/4745173

   I believe 'AS' used to be a required keyword, but is no longer needed, only for readability. I find 'As' is often used when creating a name for a data item in the SELECT, but not when giving a name to a table in a JOIN. For example: SELECT t.ID as TestID FROM [House] h JOIN [TestCase] t ON t.ID=h.TestID. I think this is probably because a set ...

6. How can I do an UPDATE statement with JOIN in SQL Server?

   stackoverflow.com/questions/1293330

   1. To perform an UPDATE statement with a JOIN in SQL Server, you can use the JOIN syntax in combination with the UPDATE statement. Here's an example query that should update the ud table based on the corresponding values from the sale table: UPDATE ud. SET ud.assid = sale.assid.

7. sql - What is the difference between JOIN and INNER JOIN ... -...

   stackoverflow.com/questions/565620/what-is-the-difference-between-join-and...

   It is more appropriate to say that INNER is a "noise word". INNER JOIN = JOIN. INNER JOIN is the default if you don't specify the type when you use the word JOIN. You can also use LEFT OUTER JOIN or RIGHT OUTER JOIN, in which case the word OUTER is optional, or you can specify CROSS JOIN.

8. sql - Can I use CASE statement in a JOIN condition ... - Stack...

   stackoverflow.com/questions/10256848

   A CASE expression returns a value from the THEN portion of the clause. You could use it thusly: SELECT * FROM sys.indexes i JOIN sys.partitions p ON i.index_id = p.index_id JOIN sys.allocation_units a ON CASE WHEN a.type IN (1, 3) AND a.container_id = p.hobt_id THEN 1 WHEN a.type IN (2) AND a.container_id = p.partition_id THEN 1 ELSE 0 END = 1

9. sql - JOIN two SELECT statement results - Stack Overflow

   stackoverflow.com/questions/10538539

   SELECT ks, COUNT(*) AS '# Late' FROM Table WHERE Age > Palt GROUP BY ks. which returns: ks # Late. person1 1. person2 1. And I want to join the results of these two select statements (by the KS) I'm trying to avoid using a temp table, but if that's the only practical way to do this, I'd like to know more about using temp tables in this fashion.

10. sql - Using AND in an INNER JOIN - Stack Overflow

    stackoverflow.com/questions/45987384

    3. You can join tables on specific columns, I think you got that far. With the AND in the inner join you can specify it even more. Join the tables on the columns, where A1.Column = 'TASK' and throw away the rest. You could just as easily move the AND to the WHERE -Clause. – waka.

11. sql - Condition within JOIN or WHERE - Stack Overflow

    stackoverflow.com/questions/1018952

    3. I would personally put the condition in the JOIN clause if the condition describes the relation. Generic conditions that just filter the result set would go to the WHERE part then. E.g. FROM Orders JOIN OrderParties ON Orders.Id = OrderParties.Order AND OrderParties.Type = 'Recipient' WHERE Orders.Status = 'Canceled'.