我试图通过他们存储在状态中的值（这是一个varchar 255）在我的SQLite数据库中命令我的值
该字段可以包含任何内容，但对于我选择的entity_id，它将包含十进制数字或'unknown'
所以我尝试了以下查询，但它没有工作：
select
state,
attributes,
created
from states
where state <> 'unknown'
and (entity_id = 'sensor.speedtest_download' or entity_id = 'sensor.fastcom_download')
order by cast(state as DECIMAL) DESC
Limit 0,30
如果我将order by退出查询，我会得到如下结果：
"61.8" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-11 19:00:30.842672"
"65.45" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-11 21:30:18.669531"
"65.45" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-11 21:41:30.850441"
"73.5" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-11 22:00:30.919995"
"70.14" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-11 22:00:31.098129"
"91.7" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-11 23:00:30.787601"
"80.72" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-11 23:00:30.951527"
"76.5" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-12 00:00:30.844100"
"74.87" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-12 00:00:31.013408"
"91.7" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-12 01:00:30.838618"
"83.5" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-12 01:00:30.976214"
"92.2" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-12 02:00:30.743759"
"83.71" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-12 02:00:30.899923"
"84.4" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-12 03:00:30.814488"
"73.27" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-12 03:00:30.941021"
"78.9" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-12 04:00:30.751924"
"77.79" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-12 04:00:30.926943"
"90.6" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-12 05:00:30.762564"
"82.41" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-12 05:00:31.452064"
"71.3" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-12 06:00:30.875047"
"64.83" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-12 06:00:31.015236"
"90.9" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-12 07:00:30.770224"
"78.18" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-12 07:00:30.925578"
"86.2" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Fast.com Download""}" "2016-12-12 08:00:30.837426"
"61.4" "{""unit_of_measurement"": ""Mbit/s"", ""friendly_name"": ""Download""}" "2016-12-12 08:00:30.990303"
使用order by我得到：
database disk image is malformed: select state, created from states
where state <> 'unknown' and (entity_id = 'sensor.speedtest_download' or entity_id = 'sensor.fastcom_download')
order by cast(state as DECIMAL) DESC
Limit 0,30