order by

根据order by指定的列,对结果排序。

例子

$ sym = `C`MS`MS`MS`IBM`IBM`C`C`C$SYMBOL
$ price= 49.6 29.46 29.52 30.02 174.97 175.23 50.76 50.32 51.29
$ qty = 2200 1900 2100 3200 6800 5400 1300 2500 8800
$ timestamp = [09:34:07,09:36:42,09:36:51,09:36:59,09:32:47,09:35:26,09:34:16,09:34:26,09:38:12]
$ t1 = table(timestamp, sym, qty, price);
$ t1;

timestamp

sym

qty

price

09:34:07

C

2200

49.6

09:36:42

MS

1900

29.46

09:36:51

MS

2100

29.52

09:36:59

MS

3200

30.02

09:32:47

IBM

6800

174.97

09:35:26

IBM

5400

175.23

09:34:16

C

1300

50.76

09:34:26

C

2500

50.32

09:38:12

C

8800

51.29

select * from t1 order by sym, timestamp;

timestamp

sym

qty

price

09:34:07

C

2200

49.6

09:34:16

C

1300

50.76

09:34:26

C

2500

50.32

09:38:12

C

8800

51.29

09:32:47

IBM

6800

174.97

09:35:26

IBM

5400

175.23

09:36:42

MS

1900

29.46

09:36:51

MS

2100

29.52

09:36:59

MS

3200

30.02

可使用"desc"关键字进行降序排序。

select * from t1 where sym in `C`IBM order by sym, timestamp desc;

timestamp

sym

qty

price

09:38:12

C

8800

51.29

09:34:26

C

2500

50.32

09:34:16

C

1300

50.76

09:34:07

C

2200

49.6

09:35:26

IBM

5400

175.23

09:32:47

IBM

6800

174.97