多表联合查询的SQL语句多表联合查询SQL语句⼀：
select dpt.`dept_namee`,
dpt.`principal_name`,
dpt.`unit_type`,
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info.`sys_name`,
info.`dept_name`,
info.`begin_use_time`,
gd.`pro_grade`,
gd.`pro_time`,transform的中文谐音
gd.`jug_res`,
gd.`gov_res`
from depart as dpt
left join info_sys as info on dpt.dept_namee = info.dept_namee开启telnet有什么用
left join grade as gd on info.dept_namee = gd.dept_namee
多表联合查询SQL语句⼆（这个查询语句是李⼤哥写的）
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select sdpt.`name` as departName ,dpt.*,sys.*,g.* from info_sys as sys
LEFT JOIN grade g on sys.id = g.infosys_id
LEFT JOIN material m on g.id = m.grade_id
LEFT JOIN depart dpt on sys.dept_namee = dpt.dept_namee
LEFT JOIN sys_dept sdpt on dpt.dept_namee = sdpt.dept_id;
mysql面试题sql语句多表联查多表联合查询SQL语句三：
select info.`dept_namee`,
monologue和dialogue的区别dpt.`principal_name`,
dpt.`unit_type`,
info.`sys_name`,
info.`dept_name`,
info.`begin_use_time`,
gd.`pro_grade`,
gd.`pro_time`,
gd.`jug_res`,
gd.`gov_res`
from depart as dpt
left join info_sys as info on dpt.dept_namee = info.dept_namee
left join grade as gd on dpt.dept_namee = gd.dept_namee
and info.dept_namee = gd.dept_namee
这张表的查询语句是李⼤哥写的
select info.* from depart as d LEFT JOIN info_sys as info on d.id = info.dept_name
left join grade g on info.id = g.sysinfo_id
left join matarial m on g.id = m.grade_id
where d.detail_address='详细地址' or g.name='';

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