题目
有如下1张表G0831
希望得到如下结果（根据TransType取每道OprSeq的开始与结束时间，其中，开始-换班是一组，开始-结束是一组)
测试语句
代码语言：javascript复制Create table G0831 (
TransType varchar(22),
OprSeq int,
OpCode varchar(24),
TransTime varchar(34)
);
INSERT INTO G0831 VALUES('开始',10,'NF21','2019-11-30 14:06');
INSERT INTO G0831 VALUES('换班',10,'NF21','2019-11-30 14:09');
INSERT INTO G0831 VALUES('开始',10,'NF21','2019-11-30 14:10');
INSERT INTO G0831 VALUES('结束',10,'NF21','2019-11-30 14:13');
INSERT INTO G0831 VALUES('开始',20,'NF22','2019-11-30 14:15');
INSERT INTO G0831 VALUES('结束',20,'NF22','2019-11-30 14:16');
INSERT INTO G0831 VALUES('开始',30,'NF24','2019-11-30 14:17');
INSERT INTO G0831 VALUES('结束',30,'NF24','2019-11-30 14:20');
