Is there a way to combine these two statements into one without having duplicate entries? My first, obvious attempt is not supported by SQLITE (Syntax error: Limit clause should come after UNION not before): Answer Use subqueries and perform the limit within them.
How to check if mysql table is empty?
How to check if my table is empty from C#? I have something like: public MySqlConnection con; public MySqlCommand cmd; con = new MySqlConnection(GetConnectionString()); con.Open(); cmd = new …
Database normalization – who’s right?
My professor (who claimed to have a firm understanding about systems development for many years) and I are arguing about the design of our database. As an example: My professor insists this design is …
Counting number of records hour by hour between two dates in oracle
I need a SINGLE query that does this sequence in oracle. As you see the hour is increasing one by one. here is the output I have written a query but it does not give me the right answer! this query gives me a result set that sum of it’s count(*) is equal to the first query written above! here
SQL Server – copy stored procedures from one db to another
I am new to SQL, and what I needed to do was to combine 2 .mdf databases into one. I did that using SQL Server 2008 Manager – Tasks > Import/Export tables.The tables and views were copied successfully, but there are no Stored procedures in the new database. Is there any way to do that? Answer Right c…
SQL query with avg and group by
I have some problems with writing a SQL query for MySQL. I have a table with the following structure: mysql> select id, pass, val from data_r1 limit 10; +————+————–+—————…
SQL Server: backup all databases
I was wondering if there was any way of making a backup of an entire SQL Server (we are using SQL Server 2008) at regular intervals to a specific location. I know we are able to backup single specific databases but for ease of use and not having to set up a backup each time I want a new database,
SQL: two tables with same primary key
I have two tables: Person (personID, name, address, phone, email) Player (dateOfBirth, school) What code would I use so I could use the personID in Person as a primary key in both the Person and …
NonUniqueDiscoveredSqlAliasException when two table has same column names
I have two tables Item and Nikasa – whose definitions looks like: Item { id, name, spec} and Nikasa {id, date, item_id}. Here item_id represents Item.id. I did a simple native SQL join to select only Item.id and Nikasa.id as: But I am getting exception NonUniqueDiscoveredSqlAliasException : Encountered …
How do I query for all dates greater than a certain date in SQL Server?
I’m trying: A.Date looks like: 2010-03-04 00:00:00.000 However, this is not working. Can anyone provide a reference for why? Answer In your query, 2010-4-01 is treated as a mathematical expression, so in essence it read (2010 minus 4 minus 1 is 2005 Converting it to a proper datetime, and using single q…