SELECT b.CallerNum, b.Duration duration, min(b.CRT_TIME_) abnormalTime, count(b.CallerNum) abnormalCallNumber, count(b.CallerNum) abnormalCallTotal FROM basebill b left join billdetails b2 on b.base_bill_id =b2.base_bill_id where b2.area_code_ != 86 and b.billType = 1 and b.IS_DELETE_ = 0 and b.CRT_TIME_ >= '2023-06-06 13:00:00' and b.CRT_TIME_ <= '2023-06-06 15:00:00' and ( (b.Duration >=900) or (b.CallerNum in (SELECT b.CallerNum FROM basebill b left join billdetails b2 on b.base_bill_id =b2.base_bill_id where b2.area_code_ != 86 and b.billType = 1 and b.IS_DELETE_ = 0 and b.CRT_TIME_ >= '2023-06-06 13:00:00' and b.CRT_TIME_ <= '2023-06-06 15:00:00' GROUP BY b.CallerNum HAVING COUNT(b.CallerNum) >= 5)) or ((SELECT COUNT(*) FROM basebill b1 left join billdetails b2 on b1.base_bill_id =b2.base_bill_id where b2.area_code_ != 86 and b1.billType = 1 and b1.IS_DELETE_ = 0 and b1.CRT_TIME_ >= '2023-06-06 13:00:00' and b1.CRT_TIME_ <= '2023-06-06 15:00:00' and b1.CallerNum = b.CallerNum ) >= 10) ) group by b.CallerNum优化这条sql的查询速度，具体做法

具体做法如下：

1. 对where条件中的字段建立索引：针对b2.area_code_、b.billType、b.IS_DELETE_、b.CRT_TIME_、b.Duration、b.CallerNum等字段建立相应的索引，可以提高查询效率。

2. 避免使用子查询：将子查询改写成join操作，可以提高查询速度。例如：

SELECT b.CallerNum, b.Duration duration, min(b.CRT_TIME_) abnormalTime, count(b.CallerNum) abnormalCallNumber, count(b.CallerNum) abnormalCallTotal 
FROM basebill b 
LEFT JOIN billdetails b2 ON b.base_bill_id = b2.base_bill_id 
LEFT JOIN (SELECT CallerNum, COUNT(*) AS cnt FROM basebill WHERE IS_DELETE_ = 0 AND CRT_TIME_ >= '2023-06-06 13:00:00' AND CRT_TIME_ <= '2023-06-06 15:00:00' GROUP BY CallerNum HAVING COUNT(*) >= 5) AS t1 ON b.CallerNum = t1.CallerNum 
LEFT JOIN (SELECT CallerNum, COUNT(*) AS cnt FROM basebill WHERE IS_DELETE_ = 0 AND CRT_TIME_ >= '2023-06-06 13:00:00' AND CRT_TIME_ <= '2023-06-06 15:00:00' GROUP BY CallerNum HAVING COUNT(*) >= 10) AS t2 ON b.CallerNum = t2.CallerNum 
WHERE b2.area_code_ != 86 AND b.billType = 1 AND b.IS_DELETE_ = 0 AND b.CRT_TIME_ >= '2023-06-06 13:00:00' AND b.CRT_TIME_ <= '2023-06-06 15:00:00' AND (b.Duration >= 900 OR t1.CallerNum IS NOT NULL OR t2.CallerNum IS NOT NULL) 
GROUP BY b.CallerNum

3. 避免重复查询：在where条件和select语句中都有重复查询的情况，可以将重复查询的部分提取出来，减少查询次数。例如：

SELECT b.CallerNum, b.Duration duration, min(b.CRT_TIME_) abnormalTime, count(b.CallerNum) abnormalCallNumber, count(b.CallerNum) abnormalCallTotal 
FROM basebill b 
LEFT JOIN billdetails b2 ON b.base_bill_id = b2.base_bill_id 
LEFT JOIN (SELECT CallerNum, COUNT(*) AS cnt FROM basebill WHERE IS_DELETE_ = 0 AND CRT_TIME_ >= '2023-06-06 13:00:00' AND CRT_TIME_ <= '2023-06-06 15:00:00' GROUP BY CallerNum HAVING COUNT(*) >= 5) AS t1 ON b.CallerNum = t1.CallerNum 
LEFT JOIN (SELECT CallerNum, COUNT(*) AS cnt FROM basebill WHERE IS_DELETE_ = 0 AND CRT_TIME_ >= '2023-06-06 13:00:00' AND CRT_TIME_ <= '2023-06-06 15:00:00' GROUP BY CallerNum HAVING COUNT(*) >= 10) AS t2 ON b.CallerNum = t2.CallerNum 
WHERE b2.area_code_ != 86 AND b.billType = 1 AND b.IS_DELETE_ = 0 AND b.CRT_TIME_ BETWEEN '2023-06-06 13:00:00' AND '2023-06-06 15:00:00' AND (b.Duration >= 900 OR t1.CallerNum IS NOT NULL OR t2.CallerNum IS NOT NULL) 
GROUP BY b.CallerNum, b.Duration, abnormalTime

4. 分批查询：将查询时间段分成多个小段，避免一次查询过多数据，导致查询速度变慢。

5. 对于大表使用分区表：如果表中数据量较大，可以将表进行分区，以提高查询效率。

6. 定期清理无用数据：定期清理已经无用的数据，可以减少查询时的数据量，提高查询速度。

综上所述，以上优化方案可以针对不同的情况进行选择，以提高SQL语句的查询速度。