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Stop Mongoose from creating _id property for sub-document array items
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How to add ID property to Html.BeginForm() in asp.net mvc?
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MongoDB: Combine data from multiple collections into one..how?
...is real-time, you can run map-reduce multiple times to merge data together by using the "reduce" out option in MongoDB 1.8+ map/reduce (see http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-Outputoptions). You need to have some key in both collections that you can use as an _id.
For example,...
Find a string by searching all tables in SQL Server Management Studio 2008
... XML PATH('')) AS Sql
FROM @Result AS R
GROUP BY R.TableName) TB
ORDER BY TB.Sql
OPEN @tableCursor
FETCH NEXT FROM @tableCursor INTO @Sql, @TableName, @ColumnName
WHILE (@@FETCH_STATUS = 0)
BEGIN
PRINT @Sql
SELECT @TableName AS [Tab...
How to create a unique index on a NULL column?
...to expand it to more such columns.
Suppose we the information represented by a table like this:
create table the_entity_incorrect
(
id integer,
uniqnull integer null, /* we want this to be "unique and nullable" */
primary key (id)
);
We can do it by putting uniqnull apart and adding a seco...
PHP - Extracting a property from an array of objects
...r instance, see this snippet where I have a list of model objects returned by dropbox API SDK and when we try to use array_column on this array it always returns blank whereas THIS snippet works correctly, both have the protected property which is accessible in the second snippet only. I couldn't fi...
prevent property from being serialized in web API
...set; }
[DataMember]
public string Name { get; set; }
//Ignore by default
public List<Something> Somethings { get; set; }
}
For more understanding, you can read the official article.
share
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Can a foreign key be NULL and/or duplicate?
... exist first in a different table (the parent table). That is all an FK is by definition. Null by definition is not a value. Null means that we do not yet know what the value is.
Let me give you a real life example. Suppose you have a database that stores sales proposals. Suppose further that each ...
How to get form field's id in Django?
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What's the best way to send a signal to all members of a process group?
...
Better look at stackoverflow.com/questions/392022/… its by far a more elegant solution and if you need to list the pids of the children then use: ps -o pid --no-headers --ppid $PARENT_PID
– Szymon Jeż
Sep 15 '11 at 11:19
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