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LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?
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Joining on multiple columns in Linq to SQL is a little different.
var query =
from t1 in myTABLE1List // List<TABLE_1>
join t2 in myTABLE1List
on new { t1.ColumnA, t1.ColumnB } equals new { t2.ColumnA, t2.ColumnB }
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You have to take a...
Is there a performance difference between CTE , Sub-Query, Temporary Table or Table Variable?
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SQL is a declarative language, not a procedural language. That is, you construct a SQL statement to describe the results that you want. You are not telling the SQL engine how to do the work.
As a general rule, it is a good...
SQL - find records from one table which don't exist in another
I've got the following two SQL tables (in MySQL):
8 Answers
8
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How to create a new database using SQLAlchemy?
Using SQLAlchemy, an Engine object is created like this:
4 Answers
4
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Display names of all constraints for a table in Oracle SQL
...ch of the constraint for the multiple tables that I have created in Oracle SQL.
6 Answers
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How to force a SQL Server 2008 database to go Offline
...not hang and not kill existing connections. See http://www.blackwasp.co.uk/SQLOffline.aspx for details
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EF5: Cannot attach the file ‘{0}' as database '{1}'
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If you delete the DB file, it still stays registered with SqlLocalDB. Sometimes it fixes it to delete the DB. You can do this from the command line.
Open the "Developer Command Propmpt for VisualStudio" under your start/programs menu.
Run the following commands:
sqllocaldb.exe st...
How do I perform the SQL Join equivalent in MongoDB?
How do I perform the SQL Join equivalent in MongoDB?
19 Answers
19
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SQL Server SELECT into existing table
...ting an "undeclared variable" error. Though maybe this issue is only for MySQL. The CREATE TABLE ... LIKE .. worked;
– LazerSharks
Jul 7 '13 at 22:35
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App Inventor 2 LLMAI2Ext 自研拓展：接入DeepSeek、Kimi、通义千问...等国...
...不太便捷，且各种限制。
如今我们又身处AI浪潮之中，包括很多学校在内的国内用户都有AI结合传统的App来开发具有智能App的需求，因此，必须开发拓展以接入国内大模型，对，它专门接国内大模型的，国外的不接。
拓展接口...