大约有 40,000 项符合查询结果（耗时：0.0275秒） [XML]
MIN/MAX vs ORDER BY and LIMIT
...ay' and 'NULL' rows) whereas the SORT and LIMIT still needs needs to do an ordered traversal of the index (106,000 rows). The actual performance impact is probably negligible.
It looks like MIN() is the way to go - it's faster in the worst case, indistinguishable in the best case, is standard SQL ...
Mockito verify order / sequence of method calls
...
InOrder helps you to do that.
ServiceClassA firstMock = mock(ServiceClassA.class);
ServiceClassB secondMock = mock(ServiceClassB.class);
Mockito.doNothing().when(firstMock).methodOne();
Mockito.doNothing().when(secondMock)...
How do I find a “gap” in running counter with SQL?
...LL
FROM mytable mi
WHERE mi.id = mo.id + 1
)
ORDER BY
id
LIMIT 1
In SQL Server:
SELECT TOP 1
id + 1
FROM mytable mo
WHERE NOT EXISTS
(
SELECT NULL
FROM mytable mi
WHERE mi.id = mo.id + 1
)
ORDER BY
...
Proper way to wait for one function to finish before continuing?
...e.
The function I created will be completed after 2s. I used
setTimeout in order to demonstrate the situation where the
instructions would take some time to execute.
For the second function, you can use
async/await
function where you will await for the first function to complete
before proceeding wi...
how does Array.prototype.slice.call() work?
...
since object keys has no order, this specific demonstration might fail in other browsers. not all vendors sort their objects' keys by order of creation.
– vsync
Feb 21 '14 at 10:08
...
How do I get a distinct, ordered list of names from a DataTable using LINQ?
... with a Name column. I want to generate a collection of the unique names ordered alphabetically. The following query ignores the order by clause.
...
postgresql return 0 if returned value is null
... your query:
SELECT AVG( price )
FROM(
SELECT *, cume_dist() OVER ( ORDER BY price DESC ) FROM web_price_scan
WHERE listing_Type = 'AARM'
AND u_kbalikepartnumbers_id = 1000307
AND ( EXTRACT( DAY FROM ( NOW() - dateEnded ) ) ) * 24 < 48
AND COALESCE( price, 0 )...
INNER JOIN ON vs WHERE clause
...o has a STRAIGHT_JOIN clause.
Using this clause, you can control the JOIN order: which table is scanned in the outer loop and which one is in the inner loop.
You cannot control this in MySQL using WHERE syntax.
share
...
How to check Oracle database for long running queries
... s.sql_hash_value
and s.status = 'ACTIVE'
and s.username <> 'SYSTEM'
order by s.sid,t.piece
/
This shows locks. Sometimes things are going slow, but it's because it is blocked waiting for a lock:
select
object_name,
object_type,
session_id,
type, -- Type or system/user l...
How to sort a HashMap in Java [duplicate]
... you're handed existing Maps and just want to iterate through them in some order. Also, the LinkedHashMap can maintain by insertion order (which I often like for debugging), or by access order. And finally if you're doing a lot of this you might check out Java 1.6 and NavigableMap, awesome stuff!
...