大约有 31,500 项符合查询结果（耗时：0.0252秒） [XML]
Can you have if-then-else logic in SQL? [duplicate]
...
WITH cte AS (
SELECT product,price,1 a FROM table1 WHERE project=1 UNION ALL
SELECT product,price,2 a FROM table1 WHERE customer=2 UNION ALL
SELECT product,price,3 a FROM table1 WHERE company=3
)
SELECT TOP 1 WITH TIES product,price FROM cte ORDER BY a;
An SQLfiddle to test with.
...
'any' vs 'Object'
...d to accept multiple known types, a better approach is to declare it using union types, as in
function fc(param: string|number): void {}
Obviously, OO inheritance rules still apply, so if you want to accept instances of derived classes and treat them based on their base type, as in
interface IPe...
Convert json data to a html table [closed]
...s a header row to the table and returns the set of columns.
// Need to do union of keys from all records as some records may not contain
// all records.
function addAllColumnHeaders(myList, selector) {
var columnSet = [];
var headerTr$ = $('<tr/>');
for (var i = 0; i < myList....
Google Map API v3 — set bounds and center
...ke polygons and circles, you can use following codes:
For Circles
bounds.union(circle.getBounds());
For Polygons
polygon.getPaths().forEach(function(path, index)
{
var points = path.getArray();
for(var p in points) bounds.extend(points[p]);
});
For Rectangles
bounds.union(overlay.get...
Why does C++ require a user-provided default constructor to default-construct a const object?
...type X (or array thereof), X
is const-default-constructible,
if T is a union with at least one non-static data member, exactly one variant member has a default member initializer,
if T is not a union, for each anonymous union member with at least one non-static data member (if any), exactly on...
Merge and interleave two arrays in Ruby
...e a, you can write a | b and assign the result to a variable.
See the set union documentation for the Array class at http://www.ruby-doc.org/core/classes/Array.html#M000275.
This answer assumes that you don't want duplicate array elements. If you want to allow duplicate elements in your final arra...
Elegant way to combine multiple collections of elements?
...r combined = foo.Concat(bar).Concat(foobar).Concat(...);
Alternatively, .Union() will remove duplicate elements.
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How to declare a type as nullable in TypeScript?
...wever, salary = undefined; will work just fine in this case. Solution: use Union i.e. '|'
– Ankur Nigam
Apr 21 at 6:19
...
When should I use cross apply over inner join?
... master
),
t AS
(
SELECT 1 AS id
UNION ALL
SELECT 2
)
SELECT *
FROM t
JOIN q
ON q.rn <= t.id
runs for almost 30 seconds, while this one:
WITH t AS
(
SELECT 1 AS id
UNION ALL
SELECT 2
...
Difference between CTE and SubQuery?
... most useful for recursion:
WITH hier(cnt) AS (
SELECT 1
UNION ALL
SELECT cnt + 1
FROM hier
WHERE cnt < @n
)
SELECT cnt
FROM hier
will return @n rows (up to 101). Useful for calendars, dummy rowsets etc.
They are also more readable (i...