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Django in / not in query

... table1.objects.exclude(id__in= table2.objects.filter(your_condition).values_list('id', flat=True)) The exclude function works like the Not operator you where asking for. The attribute flat = True tells to table2 query t...
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Most efficient way to determine if a Lua table is empty (contains no entries)?

What's the most efficient way to determine if a table is empty (that is, currently contains neither array-style values nor dict-style values)? ...
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Hidden Features of SQL Server

...T clause allows to do this very easily - it allows access to the "virtual" tables called inserted and deleted (like in triggers): DELETE FROM (table) OUTPUT deleted.ID, deleted.Description WHERE (condition) If you're inserting values into a table which has an INT IDENTITY primary key field, with ...
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Hidden Features of MySQL

...t connections, but self compiled binaries often have less of a limit. Set table_cache to match the number of your open tables and concurrent connections. Watch the open_tables value and if it is growing quickly you will need to increase its size. Note: The 2 previous parameters may require a lot...
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Change Schema Name Of Table In SQL

I want to change schema name of table Employees in Database. In the current table Employees database schema name is dbo I want to change it to exe . How can I do it ? ...
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MySQL: Insert record if not exists in table

...er way to do it, but you can actually do what you were attempting: CREATE TABLE `table_listnames` ( `id` int(11) NOT NULL auto_increment, `name` varchar(255) NOT NULL, `address` varchar(255) NOT NULL, `tele` varchar(255) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB; Insert a record: I...
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Is SQL syntax case sensitive?

...OM, WHERE, etc), but are often written in all caps. However in some setups table and column names are case-sensitive. MySQL has a configuration option to enable/disable it. Usually case-sensitive table and column names are the default on Linux MySQL and case-insensitive used to be the default on Win...
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Change type of varchar field to integer: “cannot be cast automatically to type integer”

I have a small table and a certain field contains the type " character varying ". I'm trying to change it to " Integer " but it gives an error that casting is not possible. ...
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td widths, not working?

...utanyspaces), the cell will stretch nevertheless, unless your CSS contains table-layout: fixed for the table. EDIT As kristina childs noted on her answer, you should avoid both the width attribute and using inline CSS (with the style attribute). It's a good practice to separate style and structure...
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How to design a product table for many kinds of product where each product has many parameters

I do not have much experience in table design. My goal is to create one or more product tables that meet the requirements below: ...