如果省略此参数,则截取从start_index开始到字符串末尾的所有字符。 确定截取字符串的起始位置和长度: 你需要根据实际需求确定截取的起始位置和长度。例如,如果你想从第3个字符开始截取,截取长度为5个字符,则start_index为3,length为5。 在Flink SQL查询中应用截取操作: 在查询中,你可以使用SUBSTRING函数对指定字段...
11、sqlserver 分组查询最新的时间的 SELECT rllu_number, SUBSTRING_INDEX(GROUP_CONCAT(create_time order by create_time desc ),',',1) from tb_melting_measurement GROUP BY rllu_number order by create_time desc ; 12、EXPLAIN EXPLAIN SELECT * from tb_order_plan order by create_time desc limit...
select SUBSTRING_INDEX(SUBSTRING_INDEX(GROUP_CONCAT(price ORDER BY CAST(price AS DECIMAL(12,2)) SEPARATOR ','),',',25/100*count(1)),',',-1) from ad_feature; 1. 2. 1.2.2 衍生字段 衍生价格等级price_level字段 0~100 1级 、100~200 2级 以此类推 共8个级别 2 结合图表分析 2.1 分...
SELECTSUBSTRING('',222222222)asvar1,SUBSTRING(str,2)asvar2,SUBSTRING(str,-2)asvar3,SUBSTRING(str,-2,1)asvar4,SUBSTRING(str,2,1)asvar5,SUBSTRING(str,22)asvar6,SUBSTRING(str,-22)asvar7,SUBSTRING(str,1)asvar8,SUBSTRING(str,0)asvar9,SUBSTRING(nullstr,0)asvar10FROMT1; 测试结果 REVERS...
Flink SPLIT_INDEX 函数,将string表示的字符串以separator指定的分隔符拆分,并获取第 index 项,返回值...
int index = v.lastIndexOf("+") != -1 ? v.lastIndexOf("+") : v.lastIndexOf("-"); String timezonePart = v.substring(index); Timestamp ts; if (isValidTimeZone(timezonePart)) { String datetimePart = v.substring(0, index).replace(" ", "T"); ts = Timestamp.valueOf...
VARCHAR SUBSTRING(VARCHAR a, INT start, INT len)⼊参 参数数据类型说明 a VARCHAR指定的字符串。start INT在字符串a中开始截取的位置。len INT类截取的长度。功能描述 获取字符串⼦串。截取从位置start开始,长度为len的⼦串。如果未指定len,则截取到字符串结尾。start从1开始,start为0当1看待,为负数...
substring(start,i).toLowerCase(); words.add(word); start = firstCharacterIndex(contents,i); i = start + 1; }else { i++; } } } return true; } private static int firstCharacterIndex(String s,int start) { for (int i = start;i < s.length();i++) { if (Character.isLetter(s...
{ int index=getNum(0, firstName.length()-1); String first=firstName.substring(index, index+1); int sex=getNum(0,1); String str=boy; int length=boy.length(); if(sex==0){ str=girl; length=girl.length(); name_sex = "女"; }else { name_sex="男"; } index=getNum(0,length...
("before sql = " +sql);//获取第一个from的坐标intindex = sql.indexOf("from");//将sql from坐标前的字符截断,加上 select count(1) coun 查询结果集条数的SQLsql = "select count(1) coun " + sql.substring(index);//System.out.println("after sql = " +sql);//将修改的SQL放回...