python - MySQLdb的SQL语句问题
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问题描述
问 题
import MySQLdb
conn=MySQLdb.connect(host="localhost",user="root",passwd="",db="test",charset="utf8")
cursor = conn.cursor()
n = cursor.execute("select * from studentlist")
for row in cursor.fetchall():
for r in row:
print r
像这种select * from studentlist 可以直接查询
但是如果我要换为下面类似语句,就会出现错误。
SELECT
student_statistics_day.stat_day AS `日期`,
studentlist.`name` AS `姓名`,
studentlist.phone AS `手机`,
studentlist.class AS `班级`,
student_statistics_day.online_time AS `上课时间`,
student_statistics_day.level_name AS `级别`
FROM
studentlist
LEFT JOIN student_statistics_day ON studentlist.student_id = student_statistics_day.student_id
LEFT JOIN student_day ON student_statistics_day.student_id = student_day.student_id
WHERE
student_statistics_day.level_name = "优秀"
OR student_statistics_day.level_name = "良好"
ORDER BY
`studentlist` DESC
解决方案
这种复杂查询语句建议用三引号"""
包裹, 试试看, 没准就欧了
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