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What are the respective advantages/limitations of Amazon RDS vs. EC2 with MySQL? [closed]
... you can consider EC2 + EBS RAID 0. Vanilla EC2 is a terrible option for MySQL hosting.
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MySQL Great Circle Distance (Haversine formula)
...ript that gets Longitude and Latitude values and then inputs them into a MySQL query. I'd like to make it solely MySQL. Here's my current PHP Code:
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Entity Framework: “Store update, insert, or delete statement affected an unexpected number of rows (
...ata (Which meant when you went to save it 0 rows actually got updated). In SQL terms, their update query's where clause contains the original value of every field in the row, and if 0 rows are affected it knows something's gone wrong.
The idea behind it is that you won't end up overwriting a change...
How can you hide database output in Rails console?
...trying use a pointer to a logger that is set to nil (source: Disable Rails SQL logging in console)
To turn it back on
ActiveRecord::Base.logger.level = 0
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SQLAlchemy: Creating vs. Reusing a Session
Just a quick question: SQLAlchemy talks about calling sessionmaker() once but calling the resulting Session() class each time you need to talk to your DB. For me that means the second I would do my first session.add(x) or something similar, I would first do
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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...
Removing duplicate rows from table in Oracle
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You should do a small pl/sql block using a cursor for loop and delete the rows you don't want to keep. For instance:
declare
prev_var my_table.var1%TYPE;
begin
for t in (select var1 from my_table order by var 1) LOOP
-- if previous var equal cur...
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 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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Kill a postgresql session/connection
How can I kill all my postgresql connections?
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