Question

在包含一些用于测试的字段的表格中，我们可以选择field = 0.0但不是＆lt;＆gt; 0.0

表格内容：

| id     | lower_name         | sphinx_internal_id | sphinx_internal_class | sphinx_deleted | latt     | lngt     | status_hash | uploaded_as_hash | wifi |
| 119626 | lekarna novo mesto |              23925 | Spot                  |              0 | 0.000000 | 0.400000 |    75439824 |         21396735 |    0 |
| 119627 | lekarna novo mesto |              23925 | Spot                  |              0 | 0.000000 | 1.700000 |    75439824 |         21396735 |    0 |
2 row in set (0.00 sec)

示例输出：

>  SELECT * FROM `spot_core`, `spot_delta` WHERE `latt` = 0.0;
| id     | lower_name         | sphinx_internal_id | sphinx_internal_class | sphinx_deleted | latt     | lngt     | status_hash | uploaded_as_hash | wifi |
| 119626 | lekarna novo mesto |              23925 | Spot                  |              0 | 0.000000 | 0.000000 |    75439824 |         21396735 |    0 |
1 row in set (0.00 sec)

>  SELECT * FROM `spot_core`, `spot_delta` WHERE `latt` <> 0.0;
ERROR 1064 (42000): sphinxql: NEQ filter on floats is not (yet?) supported near '0.0'

>  SELECT * FROM `spot_core`, `spot_delta` WHERE `latt` != 0.0;
ERROR 1064 (42000): sphinxql: NEQ filter on floats is not (yet?) supported near '0.0'

>  SELECT * FROM `spot_core`, `spot_delta` WHERE `latt` != 0;
Empty set, 1 warning (0.00 sec)

>  SELECT * FROM `spot_core`, `spot_delta` WHERE `latt` <>  0;
Empty set, 1 warning (0.00 sec)

Answer 1

可以做到

SELECT *,IF(latt<>0.0,1,0) AS myint FROM `spot_core`, `spot_delta` WHERE myint = 1;

IF（）函数实现比较浮点数所需的阈值。

Sphinx在SELECT`field`＆lt;＆gt;上失败0.0

1 个答案: