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How to design a product table for many kinds of product where each product has many parameters
...gardless you have a blob of attributes that can't be easily queried within SQL; you have to fetch the whole blob back to the application and sort it out there.
Entity-Attribute-Value: One table for Products, and one table that pivots attributes to rows, instead of columns. EAV is not a valid design...
LINQ - Full Outer Join
...rJoin);
This works as written since it is in LINQ to Objects. If LINQ to SQL or other, the query processor might not support safe navigation or other operations. You'd have to use the conditional operator to conditionally get the values.
i.e.,
var leftOuterJoin =
from first in firstNames
...
Insert Update trigger how to determine if insert or update
...L attempt, but the DELETED and INSERTED tables are empty. This is because SQL still accounts for times when you want to log each DML attempt (even when they do not alter any data).
– MikeTeeVee
Jan 24 at 15:04
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技术人员如何创业《四》- 打造超强执行力团队 - 资讯 - 清泛网 - 专注C/C++...
...，团队不信任合作会举步维艰，推动不了任何事情。信任包括同事对同事、上级对下级、下级对上级，任何一个环节都很重要。作为领导人怎么处理？
认真思考每个人的性格和能力并根据能力安排好他们的位置和作用。这...
Hibernate: hbm2ddl.auto=update in production?
...so much of a hiccup with hibernate. We are a small team and are all mostly SQL RDBS beginners and have better faith in Hibernate handling schema than we do ourselves. I wonder what the error rate is for having a DBA on staff managing migrations and schema changes? Is it better than 0 in ~16K deploys...
How do I use an INSERT statement's OUTPUT clause to get the identity value?
...#, when you need to get the ID back to your calling app - just execute the SQL query with .ExecuteScalar() (instead of .ExecuteNonQuery()) to read the resulting ID back.
Or if you need to capture the newly inserted ID inside T-SQL (e.g. for later further processing), you need to create a table vari...
Return number of rows affected by UPDATE statements
... get the number of rows affected by an UPDATE query in a Stored Procedure (SQL Server 2005), as a resultset. e.g.
3 Answers...
Replace a newline in TSQL
I would like to replace (or remove) a newline character in a TSQL-string.
Any Ideas?
12 Answers
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Entity Framework - Invalid Column Name '*_ID"
...have a FK to OtherTable and create these extra properties in the generated SQL.
– LUKE
Oct 16 '16 at 22:00
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What is the maximum characters for the NVARCHAR(MAX)?
I have declared a column of type NVARCHAR(MAX) in SQL Server 2008, what would be its exact maximum characters having the MAX as the length?
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