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When to use a key/value store such as Redis instead/along side of a SQL database?
...tures offers versatility to many other scenarios.
Redis, however, isn't NoSQL replacement for classic relational databases since it doesn't support many standard features of RDBMS world such as querying of your data which might slow it down. Replacement are rather document databases like MongoDB or...
Kill a postgresql session/connection
How can I kill all my postgresql connections?
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How do you perform a left outer join using linq extension methods
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True, Entity Framework and Linq to SQL both require that since they can't easily do the Single check amidst a join. SingleOrDefault however is a more "correct" way to demonstrate this IMO.
– Ocelot20
Feb 3 '15 at 16:19
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conditional unique constraint
...uplicate key value is (9999).
Note: the filtered index was introduced in SQL Server 2008. For earlier versions of SQL Server, please see this answer.
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How to find all the tables in MySQL with specific column names in them?
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@Echo - you can always play with mysqldump with --skip-extended-insert and then grep through the file... dirty but strangely satifying :)
– Ken
Oct 20 '11 at 17:35
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What is the difference between IQueryable and IEnumerable?
...rties in particular—one that points to a query provider (e.g., a LINQ to SQL provider) and another one pointing to a query expression representing the IQueryable<T> object as a runtime-traversable abstract syntax tree that can be understood by the given query provider (for the most part, you...
Deleting Row in SQLite in Android
This might be a dumb question, but I'm new to SQLite and I can't seem to figure this out. I have 1 table that has columns KEY_ROWID , KEY_NAME , KAY_LATITUDE , and KEY_LONGITUDE . I want the user to be able to select one and delete it; Can anyone give me a direction to start in? My question i...
Importing a CSV file into a sqlite3 database table using Python
I have a CSV file and I want to bulk-import this file into my sqlite3 database using Python. the command is ".import .....". but it seems that it cannot work like this. Can anyone give me an example of how to do it in sqlite3? I am using windows just in case.
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How to create a database from shell command?
I'm looking for something like createdb in PostgreSQL or any other solution that would allow me to create database with a help of a shell command. Any hints?
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Hibernate throws MultipleBagFetchException - cannot simultaneously fetch multiple bags
...getResultList();
In the first JPQL query, distinct DOES NOT go to the SQL statement. That's why we set the PASS_DISTINCT_THROUGH JPA query hint to false.
DISTINCT has two meanings in JPQL, and here, we need it to deduplicate the Java object references returned by getResultList on the Java...