NET assemblies in the database, while prior versions of SQL Server were restricted to unmanaged extended stored procedures primarily written in C. In particular date and time syntax, string concatenation, NULLs, and comparison case sensitivity vary from vendor to vendor. The folding of unquoted names to lower case in PostgreSQL is incompatible with the SQL standard,  which says that unquoted names should be folded to upper case.
Linq to SQL solve Transaction deadlock and Query timeout problem using uncommitted reads When your database tables start accumulating thousands of rows and many users start working on the same table concurrently, SELECT queries on the tables start producing lock contentions and transaction deadlocks.
This is a common problem in any high volume website.
Transaction Process ID was deadlocked on lock resources with another process and has been chosen as the deadlock victim.
So, if you had a query like this: There are two ways to solve this: So, if you are using Linq to SQL queries, you are going to end up with any of these problems on production pretty soon when your site becomes highly popular. When you attach SQL Profiler, you get this: The fix is to do this: So, both queries enjoy the isolation level.
This seems to be a bug in the DataContext that when it is disposed, it does not dispose the connection it is holding onto. In order to solve this, I have made a child class of the DropthingsDataContext named DropthingsDataContext2 which overrides the Dispose method and closes the connection.
There you have it, no more transaction deadlock or lock contention from Linq to SQL queries. But remember, this is only to eliminate such problems when your database already has the right indexes.
If you do not have the proper index, then you will end up having lock contention and query timeouts anyway. So, you might be reading rows from transactions that will rollback.
In such case, go for committed read or repeatable read. The downside is it wraps your calls in a transaction. Some really good examples of deadlocks are given in this article:Oct 09, · Query on a calculated yes/no field I’m trying to set up a query where one of the fields is a yes/no field.
The expression I used for the yes/no field in the form is: =IIf([AmtRec]+[AmtRec2]>=[TotalFees],True,False). SQL (/ ˌ ɛ s ˌ k juː ˈ ɛ l / () S-Q-L, / ˈ s iː k w əl / "sequel"; Structured Query Language) is a domain-specific language used in programming and designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS).
It is particularly useful in handling structured data where there are. Access Query and Filter Criteria When constructing a query or a filter, you need to tell Access what to look for in each field.
You do this by defining criteria - typing something (an "expression") into the Criteria cell of the query or filter grid. What OOP is NOT. As a first step I shall debunk some of the answers that I have seen.
In compiling the following list I picked out those descriptions which are not actually unique to OOP as those features which already exist in non-OO languages cannot be used to differentiate between the two.
Yes/No fields in MS Access are actually Boolean fields, as already mentioned by Josh in his answer. So because [LR Test] is a boolean value by itself, you don't need to compare it to anything to get Iif to work. Entry and Exit criteria is completely task dependent.
Means, it depends on what task you need to do or you have to perform. In general, entry criteria is a set of conditions that permits a task to perform, or in absence of any among these condition will not allow to perform that task is taken as the Entry Criteria of .