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Dropping Unique constraint from MySQL table
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A unique constraint is also an index.
First use SHOW INDEX FROM tbl_name to find out the name of the index. The name of the index is stored in the column called key_name in the results of that query.
Then you can use DROP INDEX:
DROP INDEX index_name O...
Add object to ArrayList at specified index
...ider using a regular Array, initialize the capacity and put objects at the index you want.
Object[] list = new Object[10];
list[0] = object1;
list[2] = object3;
list[1] = object2;
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How to reset index in a pandas dataframe? [duplicate]
...ame from which I remove some rows. As a result, I get a dataframe in which index is something like that: [1,5,6,10,11] and I would like to reset it to [0,1,2,3,4] . How can I do it?
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Exception thrown in NSOrderedSet generated accessors
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- (void)insertObject:(<#Type#> *)value in<#Property#>AtIndex:(NSUInteger)idx {
NSIndexSet* indexes = [NSIndexSet indexSetWithIndex:idx];
[self willChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:kItemsKey];
NSMutableOrderedSet *tmpOrderedSet = [NSMutab...
How to remove an element from a list by index
How do I remove an element from a list by index in Python?
18 Answers
18
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How do you use String.substringWithRange? (or, how do Ranges work in Swift?)
...You can use the substringWithRange method. It takes a start and end String.Index.
var str = "Hello, playground"
str.substringWithRange(Range<String.Index>(start: str.startIndex, end: str.endIndex)) //"Hello, playground"
To change the start and end index, use advancedBy(n).
var str = "Hello...
For-each over an array in JavaScript
...ent above, the callback is called with three: The value of each entry, the index of that entry, and a reference to the array you're iterating over (in case your function doesn't already have it handy).
Unless you're supporting obsolete browsers like IE8 (which NetApps shows at just over 4% market s...
Get the index of the object inside an array, matching a condition
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As of 2016, you're supposed to use Array.findIndex (an ES2015/ES6 standard) for this:
a = [
{prop1:"abc",prop2:"qwe"},
{prop1:"bnmb",prop2:"yutu"},
{prop1:"zxvz",prop2:"qwrq"}];
index = a.findIndex(x => x.prop2 ==="yutu");
console.log(index);
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How to get index in Handlebars each helper?
...m using Handlebars for templating in my project. Is there a way to get the index of the current iteration of an "each" helper in Handlebars?
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SQL Server Index Naming Conventions [closed]
Is there some standard way to name indexes for SQL Server? It seems that the primary key index is named PK_ and non-clustered indexes typically start with IX_. Are there any naming conventions beyond that for unique indexes?
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