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How to check if a table exists in a given schema
...
It depends on what you want to test exactly.
Information schema?
To find "whether the table exists" (no matter who's asking), querying the information schema (information_schema.tables) is incorrect, strictly speaking, because (per documentation):
On...
How to remove convexity defects in a Sudoku square?
...sudoku board stands straight, otherwise height/width (or vice versa) ratio test will most probably fail and you will not be able to detect edges of sudoku. (I also want to add that if lines that are not perpendicular to the image borders, sobel operations (dx and dy) will still work as lines will st...
Is there any simple way to find out unused strings in Android project?
....2 Android Lint does not find unused Strings, nor does it claim to. I just tested it by adding a string with a completely random id and then running Lint. I could not vote reply above down, because I don't have enough reputation :(.
– Frank Harper
Jul 31 '12 at...
Checking for a null int value from a Java ResultSet
In Java I'm trying to test for a null value, from a ResultSet, where the column is being cast to a primitive int type.
1...
java.io.Console support in Eclipse IDE
... you wouldn't want someone to be able to override the class to make a mock/testing console...
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MySQL with Node.js
...calhost:33060')
.then(session => {
const table = session.getSchema('testSchema').getTable('testTable');
// The criteria is defined through the expression.
return table.update().where('name = "bar"').set('age', 50)
.execute()
.then(() => {
return table.s...
What exactly can cause an “HIERARCHY_REQUEST_ERR: DOM Exception 3”-Error?
... the html tag when creating elements:
$("#target").append($("div").text("Test"));
Will raise this error because what you meant was
$("#target").append($("<div>").text("Test"));
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Maximum size of an Array in Javascript
...y dependent on your target machine and your actual code, so you'll need to test on that (those) platform(s) to see what is acceptable.
However, the maximum length of an array according to the ECMA-262 5th Edition specification is bound by an unsigned 32-bit integer due to the ToUint32 abstract oper...
MongoDB logging all queries
... can log all queries:
$ mongo
MongoDB shell version: 2.4.9
connecting to: test
> use myDb
switched to db myDb
> db.getProfilingLevel()
0
> db.setProfilingLevel(2)
{ "was" : 0, "slowms" : 1, "ok" : 1 }
> db.getProfilingLevel()
2
> db.system.profile.find().pretty()
Source: http://doc...
In SQL, what's the difference between count(column) and count(*)?
... rows having a non-null value on the rows.
Please see following code for test executions SQL Server 2008:
-- Variable table
DECLARE @Table TABLE
(
CustomerId int NULL
, Name nvarchar(50) NULL
)
-- Insert some records for tests
INSERT INTO @Table VALUES( NULL, 'Pedro')
INSERT INTO @Tab...