这是我的查询的 sql 和输出...
sql:
SELECT
id ID,
token TK,
actual_pay PAY,
IF(@rtp IS NULL, @rtp:=token, @rtp:=@bal+actual_pay) RTP,
IF(@bal IS NULL, @bal:=actual_pay-token, @bal:=@rtp-token) BAL
FROM token_table a
JOIN (SELECT @rtp:=NULL, @bal:=NULL) b;
输出:
+----+------+-----+------+------+
| ID | TK | PAY | RTP | BAL |
+----+------+-----+------+------+
| 1 | 500 | 900 | 500 | 400 |
| 2 | 1200 | 900 | 1300 | 100 |
| 3 | 900 | 900 | 1000 | 100 |
| 4 | 900 | 900 | 1000 | 100 |
| 5 | 400 | 900 | 1000 | 600 |
| 6 | 300 | 900 | 1500 | 1200 |
| 7 | 500 | 900 | 2100 | 1600 |
| 8 | 1700 | 900 | 2500 | 800 |
| 9 | 1800 | 900 | 1700 | -100 |
| 10 | 800 | 900 | 800 | 0 |
| 11 | 900 | 900 | 900 | 0 |
| 12 | 0 | 850 | 850 | 850 |
+----+------+-----+------+------+
这是我想要得到的输出......
问题:
1. stat字段的公式为:如果BAL的值(从ID=1)小于或等于TK的值(从ID=2),如果是则该值应为1,否则该值应2.nbal
字段的公式为:如果BAL(从ID=1)的值小于或等于TK(从ID=2)的值,如果是则该值应为0,否则该值应该是 BAL(来自 ID=1)减去 TK(来自 ID=2)。
3. ntk字段的公式为:如果BAL(从ID=1)的值小于或等于TK(从ID=2)的值,如果是,则该值应该是TK(从ID=2)减去BAL (来自 ID=1),否则该值应为 BAL(来自 ID=1)减去 TK(来自 ID=2)。
+----+------+-----+------+------+------+------+------+
| ID | TK | PAY | RTP | BAL | stat | nbal | ntk |
+----+------+-----+------+------+------+------+------+
| 1 | 500 | 900 | 500 | 400 | 1 | 0 | 0 |
| 2 | 1200 | 900 | 1300 | 100 | 1 | 0 | 800 |
| 3 | 900 | 900 | 1000 | 100 | 1 | 0 | 800 |
| 4 | 900 | 900 | 1000 | 100 | 1 | 0 | 800 |
| 5 | 400 | 900 | 1000 | 600 | 0 | 300 | 300 |
| 6 | 300 | 900 | 1500 | 1200 | 0 | 700 | 0 |
| 7 | 500 | 900 | 2100 | 1600 | 1 | 0 | 0 |
| 8 | 1700 | 900 | 2500 | 800 | 1 | 0 | 100 |
| 9 | 1800 | 900 | 1700 | -100 | 1 | 0 | 1000 |
| 10 | 800 | 900 | 800 | 0 | 1 | 0 | 900 |
| 11 | 900 | 900 | 900 | 0 | 1 | 0 | 900 |
| 12 | 0 | 850 | 850 | 850 | 0 | 850 | 0 |
+----+------+-----+------+------+------+------+------+