我想逐年取出提升......我尝试但是效果不好。我的查询是。
CREATE VIEW `avg_month_all` AS
SELECT `a`.`year` AS `year`,
`a`.`month` AS `month`,
`a`.`temp_air` AS `temp_air`,
`a`.`rel_humid` AS `rel_humid`,
`a`.`soil_temp_5` AS `soil_temp_5`,
`a`.`soil_temp_20` AS `soil_temp_20`,
`a`.`soil_temp_30` AS `soil_temp_30`,
`a`.`soil_temp_60` AS `soil_temp_60`,
`a`.`air_pressure` AS `air_pressure`,
`a`.`dry_temp` AS `dry_temp`,
`a`.`wet_temp` AS `wet_temp`,
`b`.`run` AS `run`,
`b`.`velocity` AS `velocity`,
`c`.`rainfall` AS `rainfall`,
`c`.`evep` AS `evep`,
`c`.`max_temp` AS `max_temp`,
`c`.`min_temp` AS `min_temp`,
`c`.`sunshine_hrs` AS `sunshine_hrs`
FROM ((`avg_month_val` `a`
LEFT JOIN `avg_month_velo` `b`
ON(((`a`.`year` = `b`.`year`) AND (`a`.`month` = `b`.`month`))))
LEFT JOIN `avg_month_val1` `c`
ON(((`a`.`year` = `c`.`year`) AND (`a`.`month` = `c`.`month`))))
ORDER BY (`a`.`year` ASC AND `a`.`month` ASC);