下面的SQL哪些有可能经过两个阶段（只经过一次shuffle）就计算出结果：（） A: SELECT key1, key2, SUM(value1) FROM (SELECT key1, key2, COUNT(*) FROM dual GROUP BY key1, key2) t1 GROUP BY key2, key1; B: SELECT a.key1, a.key2 FROM table1 a JOIN table2 b ON a.key1 = b.key; C: SELECT *, ROW_NUMBER() OVER(PARTITION BY key ORDER BY value1, value 2) id1, ROW_NUMBER() OVER(PARTITION BY key ORDER BY value1) id2 FROM dual;

公告：维护QQ群：833371870，欢迎加入！
公告：维护QQ群：833371870，欢迎加入！
公告：维护QQ群：833371870，欢迎加入！

2022-06-08 问题

下面的SQL哪些有可能经过两个阶段（只经过一次shuffle）就计算出结果：（） A: SELECT key1, key2, SUM(value1) FROM (SELECT key1, key2, COUNT() FROM dual GROUP BY key1, key2) t1 GROUP BY key2, key1; B: SELECT a.key1, a.key2 FROM table1 a JOIN table2 b ON a.key1 = b.key; C: SELECT , ROW_NUMBER() OVER(PARTITION BY key ORDER BY value1, value 2) id1, ROW_NUMBER() OVER(PARTITION BY key ORDER BY value1) id2 FROM dual;

2022-10-30 问题

关键码key实际存放的位置是： A: key B: key - 1 C: hash(key) D: hash(hash(key))

2022-05-27 问题

Four keys to getting hired are begun in different ways stylistically. Key 1 starts with a __.Key 2 starts with a _. Key 3 starts with a . Key4 starts with a .

Four keys to getting hired are begun in different ways stylistically. Key 1 starts with a ____.Key 2 starts with a ___. Key 3 starts with a ____. Key4 starts with a ____.

2021-04-14 问题

voidScan_KEY(){if(digitalRead(KEY)==0){delay(20);if(digitalRead(KEY)==0){KEY_NUM=1;while(digitalRead(KEY)==0);}}}函数中delay(20);表示消除抖动（）。

2022-06-06 问题

How many key comparisons are needed in searching for key value 38（） A: 1 B: 2 C: 3 D: 4

2022-05-26 问题

下列C语言编程语句符合语法要求的是() A: sbit<br/>led=P1^0 B: sbit<br/>key=P3.5 C: key=1; D: LED=KEY,

2021-04-14 问题

代码填空【使用递归实现二分查找】 int binarySearch(int a[], int key, int low, int high) { if (low > high) return -1; int mid; mid = (low + high) / 2; if (key == a[mid]) return mid; else if (key < a[mid]) return (1); else return (2)________; }

代码填空【使用递归实现二分查找】 int binarySearch(int a[], int key, int low, int high) { if (low > high) return -1; int mid; mid = (low + high) / 2; if (key == a[mid]) return mid; else if (key < a[mid]) return ________(1)__________; else return ________(2)______________; }

2022-06-07 问题

According to the main area of pixels in the histogram, the tone can be divided into A: Low key, high key, middle key B: Hard tone, soft tone C: Long key, short key D: Long key, middle key, short key

2022-06-16 问题

HashMap中的put()方法参数是() A: put(value,key) B: put(key,key) C: put(key,value) D: put(key,key)

2021-04-14 问题

下列Find函数的功能是在数组里查找数字key，返回该key在数组中的下标，如果找不到则返回-1。请在_处填入适当的内容完善程序。 Function Find(ByRef a%(), ByVal key%) As Integer Dim idx%, i% idx = -1 For i = LBound(a) To UBound(a) If a(i) = key Then _ Exit Function End If Next Find = idx End Function

下列Find函数的功能是在数组里查找数字key，返回该key在数组中的下标，如果找不到则返回-1。请在_________处填入适当的内容完善程序。 Function Find(ByRef a%(), ByVal key%) As Integer Dim idx%, i% idx = -1 For i = LBound(a) To UBound(a) If a(i) = key Then _________ Exit Function End If Next Find = idx End Function

1 2 3 4 5 6 7 8 9 10