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With MySQL, how can I generate a column containing the record index in a table?
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You can also initialize @curRow by replacing the JOIN statement with a comma, like this: FROM league_girl l, (SELECT @curRow := 0) r
– Mike
Jun 27 '10 at 14:12
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What's the difference between using “let” and “var”?
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Scoping rules
Main difference is scoping rules. Variables declared by var keyword are scoped to the immediate function body (hence the function scope) while let variables are scoped to the immediate enclosing block denoted by { } (hence the block scope).
function run() {
var foo = "Foo";
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pandas GroupBy columns with NaN (missing) values
... have a DataFrame with many missing values in columns which I wish to groupby:
9 Answers
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Routing with Multiple Parameters using ASP.NET MVC
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Parameters are directly supported in MVC by simply adding parameters onto your action methods. Given an action like the following:
public ActionResult GetImages(string artistName, string apiKey)
MVC will auto-populate the parameters when given a URL like:
/Arti...
Android Spinner: Get the selected item change event
...ecuting the containing code only if there is a real item selection invoked by the user?
– Kennethvr
Dec 28 '10 at 11:53
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MySQL Select all columns from one table and some from another table
...t all columns from table 1 and only the listed columns from table 2 joined by id.
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How to display gpg key details without importing it?
...[revoked: 2016-03-01]
sub rsa4096 2016-02-24 [A] [expires: 2020-02-23]
By setting --keyid-format 0xlong, long key IDs are printed instead of the insecure short key IDs:
$ gpg a4ff2279.asc
gpg: WARNING: no command supplied. Trying...
Find first element by predicate
... BETTER: since we looking for a boolean return value, we can do it better by adding null check: return dataSource.getParkingLots().stream().filter(parkingLot -> Objects.equals(parkingLot.getId(), id)).findFirst().orElse(null) != null;
– shreedhar bhat
Ap...
MySQL Cannot Add Foreign Key Constraint
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Was caused by a different collation on the tables for me, one was UTF-8 and the other was latin1.
– ug_
Jul 23 '15 at 22:01
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How do you return the column names of a table?
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where sysobjects.xtype = 'u'
and sysobjects.name = 'MyTableName'
order by syscolumns.name
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