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log4j logging hierarchy order
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This table might be helpful for you:
Going down the first column, you will see how the log works in each level. i.e for WARN, (FATAL, ERROR and WARN) will be visible. For OFF, nothing will be visible.
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Can you get the column names from a SqlDataReader?
...case unless I used quotes around the column name. SELECT id AS "MyId" FROM table;
– styfle
Jul 13 '13 at 0:02
sir its ...
Undefined reference to `pow' and `floor'
... to tell ld runtime linker to include libm.so in the memory map and symbol table of the process, so these symbols get loaded and everything works as expected
– debuti
May 28 '18 at 13:27
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Rotated elements in CSS that affect their parent's height correctly
...hange it into a clockwise rotation):
.rotation-wrapper-outer {
display: table;
}
.rotation-wrapper-inner {
padding: 50% 0;
height: 0;
}
.element-to-rotate {
display: block;
transform-origin: top left;
/* Note: for a CLOCKWISE rotation, use the commented-out
transform instead of thi...
Two single-column indexes vs one two-column index in MySQL?
...a single composite index can speed up several kinds of queries on the same table." - Multiple-Column Indexes
– AlikElzin-kilaka
Sep 9 '18 at 4:46
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What is the difference between UNION and UNION ALL?
...cted columns need to be of the same data type.
Example: If we have two tables, 1) Employee and 2) Customer
Employee table data:
Customer table data:
UNION Example (It removes all duplicate records):
UNION ALL Example (It just concatenate records, not eliminate duplicates, so it...
UITableView - change section header color
How can I change color of a section header in UITableView?
31 Answers
31
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Algorithm for creating a school timetable
...dering if there are known solutions for algorithm of creating a school timetable. Basically, it's about optimizing "hour-dispersion" (both in teachers and classes case) for given class-subject-teacher associations. We can assume that we have sets of classes, lesson subjects and teachers associated ...
Converting Storyboard from iPhone to iPad
...e background for everything).
EDIT: It seems the default background for UITableView in the Attributes inspector is rather strange. I had to manually set the background to "Group Table View Background Color" for grouped table views, and "White Color" for non-grouped table views. It then was displa...
The cast to value type 'Int32' failed because the materialized value is null
...eady value. I think, that the error above is occured because CreditHistory table is empty. I have one record in User table and 0 records in CreditHistory table and error is occured. When I use DefaultIfEmpty(0).Sum() it works fine, but with ?? 0 it throws error. My another question is what is best...