dbms_stats.gather_table_stats(ownname=>'WKOD_VERIFY',granularity =>'all',tabname=>'LST_RNG_RANGE',cascade=>true); end; 查看主分组 select partition_position,table_name,partition_name,high_value,tablespace_name,num_rows from user_tab_partitions where table_name='LST_RNG_RANGE'; num_rows=5...
range1 = range(1, 6) list4 = list(range1) print(list4) #创建空列表 print(list()) 运行结果: ['h', 'e', 'l', 'l', 'o'] ['Python', 'Java', 'C++', 'JavaScript'] ['a', 'b', 'c'] [1, 2, 3, 4, 5] [] 访问列表元素 列表是 Python 序列的一种,我们可以使用索引(I...
where table_name='LST_RNG_RANGE'; 4.2.5、追加分区 方式一:追加主分区 alter table LST_RNG_RANGE add partition P_3512834993 values ('3512834993') 查看分区 select partition_position,table_name,partition_name,high_value,tablespace_name,num_rows from user_tab_partitions where table_name='LST_RNG_R...
return [[val]*cols]*rows # 这种写法会有一个坑,引用了同一个对象 # return [[val]*cols for _ in range(rows)] # 应该这样写 ll = init_matrix(0, 3, 4) print(ll) # [[0,0,0],[0,0,0],[0,0,0]] ll[0][0] = 100 print(ll) # [[100,0,0],[100,0,0],[100,0,0]] ...
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实例3:for循环后面还可以加上if判断,这样我们就可以筛选出仅偶数的平方:list = list(x * x for x in range(1,11) if x%2== 0) 实例4:使用两层循环,可以生成全排列: list = [m + n for m in 'ABC' for n in 'XYZ'] print(list) ...
[ index_range [, index_range]* \] ] [ \[ inner_condition \] ] * index_range ::= * number [ - number ] * 其中number的范围时 -1 ~ INT_MAX,-1表示数组最后一个位置 * 例如,GET mail_list #[1-9][domain=="qq.com"] * @param [IN] queryOpt...
[ index_range [, index_range]* \] ] [ \[ inner_condition \] ] * index_range ::= * number [ - number ] * 其中number的范围时 -1 ~ INT_MAX,-1表示数组最后一个位置 * 例如,GET mail_list #[1-9][domain=="qq.com"] * @param [IN] queryOption 查询...
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print([x for x in range(1, 101) if x % 10 == 3]) 1. b. 利用列表推到是将 列表中的整数提取出来 例如:[True, 17, "hello", "bye", 98, 34, 21] --- [17, 98, 34, 21] 1. list1 = [True, 17, "hello", "bye", 98, 34, 21] ...