How to Compare Rows in SQL?
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Problem statement: select all stores name , their status, phone numbers , effective date whose phone number has been changed from 2003 until present date. Schema is store_name,phone number , start_date , status sample rows abc 1234 30-DEC-2011 open abc 3433 04-Jan-2012 close bbb 4444 30-Jan-2010 open bbb 4444 31-Jan-2011 open Output abc 1234 open 30-DEC-3011 till 3-Jan-2012 abc 3433 close 04-Jan-2012 till date I am also fine having two rows in output with sorted start date like abc 123...
Answer:
I'm presuming that this is for Oracle rather than MySQL, as my solution uses a couple of magic tricks...
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Other solutions
Table is Product and it has (maker, model, type) column. It is assumed that model numbers in the Product table are unique for all the makers and product types. Makers column has values A,B,C,D and Type column has values PC,Laptop, Printer. Example maker...
Answer:
I can't write the SQL for you at the moment (too tired and lazy), but the way to get the answer is to...
Icebreak... at Yahoo! Answers Mark as irrelevant Undo
How many rows will the following SQL query against the REYLIB.EMP table return? SQL> select ename from REYLIB.emp where comm = NULL; (a) No rows (b) 8 rows (c) 10 rows (d) all the rows
Answer:
You have the advantage over the world here because no one knows what the heck REYLIB.EMP table is or...
jackremy at Yahoo! Answers Mark as irrelevant Undo
SQL SERVER – Delete Duplicate Records – Rows I have on table named [Duplicate] {ID int,FNAME varchar(10),MNAME varchar(10)} Here there is no key and here are duplicate rows. so hoca can i delete this duplicate rows. Check Data ID FNAME LNAME...
Answer:
The tricky part about duplicate elimination is retaining just one of the duplicates when there isn't...
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hei guys i have altered the table to add a column and started inserting values into the column without giving any condition then it took the values into new rows as i didn't gave any condition then i realized and dropped that column now the problem is...
Answer:
To remove Null rows do this DELETE FROM tablename WHERE id =NULL; I think this may help.
venki at Yahoo! Answers Mark as irrelevant Undo
SQL Filter: is there any way when making a query to create a temporary column that assigns each row in the result set an ordinal number? This is for when you not only want to count the number of items in a result set (ie, there are 50 items), you also...
Answer:
After following vacapinta's link, I'd say that provides a good way to do it, doesn't seem tricky to...
wildblueyonder at Ask.Metafilter.Com Mark as irrelevant Undo
I have two tables company and contacts in SQL. A company has c_id as primary key which is a foreign key in contacts. How can i design a query by which i can retrieve the first two contacts of every company in SQL?
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I'm working with two tables: ITEM & PriceList. My values in each table looks as Follows ITEM Table: ID (PrimaryKey) | Code --------------------------------------... 1 | Item_One 2 | Item_Two PricelIst Table PriceID (Pk) | PricelistName | ItemId ...
Answer:
As SQL Server 2008 is equipped with advanced Operators like PIVOT to ease your task.. lets use it. Based...
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I need help, I have a table name 'c' If row hace a parent, means the id of the parents is the parentid.. and so on id |parentid| content ---------------------- 1 | | A 2 | | B 3 | 1 | C 4 | 1 | D 5 | 3 | E 6 | 5 | F I want to copy that rows to the same...
Answer:
insert into c values (int, int, varchar) select id + 20, parentid, content from c where id < 10;...
ask_my_g... at Yahoo! Answers Mark as irrelevant Undo
Hi I am working in SQL Server. I have a table called TblEmp with 1 column EmpName in it. There are two rows with the same name. Is there any query thru which i can identify the unique row. I know in oracle it is Row_Num. Kindly let me know if there is...
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