查看下面信息: key1 : value key2 : #Comment -value1 -value2 key3 : subkey : subvalue 上述实例是哪种信息标记方式?
A: HTML
B: JSON
C: CSV
D: YAML
A: HTML
B: JSON
C: CSV
D: YAML
举一反三
- 在JSON字符串中,Object结构是( )。 A: key , value B: {key:value,key:value...} C: Key D: value
- 给出如下一个map,请使用迭代器迭代出里面每一个key和value的值。 Map<String,String>hashMap=new HashMap<String,String>(); hashMap.put("key1", "value1"); hashMap.put("key2", "value2"); hashMap.put("key3", "value3");
- 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;
- How many key comparisons are needed in searching for key value 38() A: 1 B: 2 C: 3 D: 4
- x = { 'key': 'value' } print(x[0]) 上述代码输出结果为____。 A: ‘key’: ‘value’ B: 无法执行 C: ‘key’ D: ‘value’