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With MySQL, how can I generate a column containing the record index in a table?
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@smhnaji MySQL requires that every "derived table" is given a name. I decided to call it "r" :) ... It has little purpose in this case, but you'd normally use it to reference attributes of the derived table, as if it was a real table.
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How to think in data stores instead of databases?
...e the sort of query that looks good on paper but is atrociously slow in an SQL database.
In terms of how to change how you represent data, the most important thing is precalculation. Instead of doing joins at query time, precalculate data and store it in the datastore wherever possible. If you want ...
ORDER BY the IN value list
I have a simple SQL query in PostgreSQL 8.3 that grabs a bunch of comments. I provide a sorted list of values to the IN construct in the WHERE clause:
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How to deploy an ASP.NET Application with zero downtime
...zero downtime on the ASP.NET app -- the question isn't "how to deploy to a sql server db with zero downtime".
– Sklivvz
Jan 20 '11 at 15:48
6
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...网络游戏中的玩家，他们将更加关心自己的排名，而不是如何让代码更好。
开发者的重点变成了统计代码所编写的行数、解决bug或把所统计的提交的仓库里。如果代码行数都计算在内的话，原本一个问题只需10行代码即可解决...
How to Join to first row
...ROM LineItems
WHERE OrderID = Orders.OrderID
)
In SQL Server 2005 and above, you could just replace INNER JOIN with CROSS APPLY:
SELECT Orders.OrderNumber, LineItems2.Quantity, LineItems2.Description
FROM Orders
CROSS APPLY
(
SELECT TOP 1 LineItems.Quan...
How to return result of a SELECT inside a function in PostgreSQL?
I have this function in PostgreSQL, but I don't know how to return the result of the query:
2 Answers
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Relational table naming convention [closed]
...rd Filing Systems [characterised by Record IDs which are implemented in an SQL database container for convenience):
the tables are the Subjects of the database, thus they are nouns, again, singular
the relationships between the tables are the Actions that take place between the nouns, thus they ar...
How to organize a node app that uses sequelize?
...rdinarily you would use select from two or more tables, or a union in pure SQL, you would have to run separate queries, and with the async nature of Node it's just added complexity.
Therefore I moved away from using Sequelize. Moreover I am switching from using ANY data fetching from DB in the mod...