I’m about selecting all employees who come New York but whenever I run the query, I always get a “Enter Parameter Value” box. How can I fix this? Answer This is because Access does not allow you to use field aliases in the query – it does not recognize [City Name] as a valid field name. Aliases are only used
Substring in select statement in JPQL
I’m trying to select a substring of column, i.e. select substring(description, 1, 200) from category where id=1 Is it possible to have a substring function within a select statement in JPQL/JPA 2? If yes, how? If no, are there any alternatives? Thanks. Answer There is a scalar expression for this: SUBSTRING(string, start, end) I believe this is allowed in the
mysql query: show summary of all payments made and total of invoices by date
I want this kind of result from these tables. I even can’t figure out how to do it with php. I even tried to join payment and invoice table on date but in vain. It’s a purchase system and this …
How to drop multiple tables in PostgreSQL using a wildcard
When working with partitions, there is often a need to delete all partitions at once. However Does not work. (The wildcard is not respected). Is there an elegant (read: easy to remember) way to drop multiple tables in one command with a wildcard? Answer Use a comma separated list: If you realy need a footgun, this one will do it’s
SQL Server SELECT LAST N Rows
This is a known question but the best solution I’ve found is something like: SELECT TOP N * FROM MyTable ORDER BY Id DESC I’ve a table with lots of rows. It is not a posibility to use that query …
SQL WHERE clause matching values with trailing spaces
In SQL Server 2008 I have a table called Zone with a column ZoneReference varchar(50) not null as the primary key. If I run the following query: select ‘”‘ + ZoneReference + ‘”‘ as …
What is dynamic SQL?
I just asked an SQL related question, and the first answer was: “This is a situation where dynamic SQL is the way to go.” As I had never heard of dynamic SQL before, I immediately searched this …
SQL query that will give me the RecordedValue range each device recorded for each date
I have a table with this schema: DeviceID int FloorID int RoomID int DateRecorded datetime RecordedValue decimal A sample of the table’s data looks like: DeviceID FloorID RoomID …
How do I safely read from a stream in asp.net?
If: Reading from a stream in a single call to Read is very dangerous. You’re assuming all the data will be made available immediately, which isn’t always the case. You should always loop round, reading until there’s no more data. How should I change the above code to make it ‘less dangerous’? Answer Jon Skeet actually has a really good
Whats the size of an SQL Int(N)?
Simple question. I have tried searching on Google and after about 6 searches, I figured it would be faster here. How big is an int in SQL? — table creation statement. intcolumn INT(N) NOT NULL, — …