[英]Mysql Select record based on last run
我有一個表,其中包含以下字段
project_name VARCHAR (100)
running_frequency enum ('daily', 'weekly', 'monthly')
last_job_run DATETIME
我想根據last_job_run
字段選擇現在到期的記錄。 例如,如果某項任務昨天運行並且選擇了每天,那么我需要查詢以選擇今天,明天等的記錄。
是否可以在不涉及PHP的情況下做到這一點?
采用:
SELECT t.*
FROM TABLE t
WHERE ( t.running_frequency = 'daily'
AND t.last_job_run < CURRENT_DATE)
OR ( t.running_frequency = 'weekly'
AND t.last_job_run <= DATE_SUB(CURRENT_DATE, INTERVAL 7 DAY))
OR ( t.running_frequency = 'monthly'
AND t.last_job_run <= DATE_SUB(CURRENT_DATE, INTERVAL 1 MONTH))
作為UNION語句,這可能會運行得更快:
SELECT x.*
FROM TABLE x
WHERE x.running_frequency = 'daily'
AND x.last_job_run < CURRENT_DATE
UNION ALL
SELECT y.*
FROM TABLE y
WHERE y.running_frequency = 'weekly'
AND y.last_job_run <= DATE_SUB(CURRENT_DATE, INTERVAL 7 DAY)
UNION ALL
SELECT z.*
FROM TABLE z
WHERE z.running_frequency = 'monthly'
AND z.last_job_run <= DATE_SUB(CURRENT_DATE, INTERVAL 1 MONTH)
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