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How do I create a unique constraint that also allows nulls?
...et_AllowNull
UNIQUE (TicketID, TicketUnique);
If IssueID 1 has ticket 123, the UNIQUE constraint will be on values (123, NULL). If IssueID 2 has no ticket, it will be on (NULL, 2). Some thought will show that this constraint cannot be duplicated for any row in the table, and still allows multip...
Get underlined text with Markdown
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98
In GitHub markdown <ins>text</ins>works just fine.
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Is there a query language for JSON?
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StaxManStaxMan
98.6k2828 gold badges184184 silver badges223223 bronze badges
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SVG gradient using CSS
...4 24h168c13 0 24-11 24-24l0-47c0-13-11-24-24-24h-21v-190c0-13-11-23-24-23h-123z"></path>
</svg>
<svg height="0" width="0">
<defs>
<linearGradient id="lgrad-p" gradientTransform="rotate(75)"><stop offset="45%" stop-color="#4169e1"><...
Hide the cursor of an UITextField
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98
You can just clear the textfield's tintColor
self.textField.tintColor = [UIColor clearColor];
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Replace string within file contents
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Adam MatanAdam Matan
98.4k110110 gold badges318318 silver badges486486 bronze badges
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How to delete/create databases in Neo4j?
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98
even more simple command to delete all nodes and relationships:
MATCH (n)
OPTIONAL MATCH (n)-[...
Why can't an anonymous method be assigned to var?
...you like to be inferred for the following cases?
var x1 = (ref int y)=>123;
There is no Func<T> type that takes a ref anything.
var x2 = y=>123;
We don't know the type of the formal parameter, though we do know the return. (Or do we? Is the return int? long? short? byte?)
var x3 =...
Application auto build versioning
...ice that full package name is required. go build -ldflags "-X pkg.version=123" won't work while go build -ldflags "-X path/to/pkg.version=123" work as expected. hope it helps.
– csyangchen
Nov 25 '15 at 9:04
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C++ deprecated conversion from string constant to 'char*'
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98
As answer no. 2 by fnieto - Fernando Nieto clearly and correctly describes that this warning is...