MySQL从一个表中查出数据并插入到另一个表的详细处理方案

insert into t_target  select * from t_source;

insert into t_target(字段1,字段2,字段3, ...)  
select 字段1,字段2,字段3, ... from t_source;

insert into t_target (字段1, 字段2, ...)  
 SELECT 字段1, 字段2, ...  FROM t_source  
 WHERE not exists (select * from t_target 
 where t_target.比较字段 = t_source.比较字段); 

-- 创建目标表
CREATE TABLE target_table (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(50),
    age INT
);

-- 确定连接条件
ALTER TABLE target_table ADD COLUMN source_table_id INT;

UPDATE target_table
SET source_table_id = source_table.id
FROM target_table
INNER JOIN source_table
ON target_table.name = source_table.name;

-- 更新数据
UPDATE target_table
INNER JOIN source_table
ON target_table.source_table_id = source_table.id
SET target_table.age = source_table.age;

UPDATE t1,t2
SET t1.score = t2.score
WHERE t1.id = t2.id AND t2.score IS NOT NULL

UPDATE t1,t2
SET t1.score = t2.score,t2.username = t1.username
WHERE t1.id = t2.id

INSERT INTO t1(id,username,score)
SELECT t2.id,t2.username,t2.score FROM t2 where t2.username = 'lucy'

   update table1 set field1=table2.field1 from table2
    where table1.id=table2.id

 UPDATE tableName1 t1
    LEFT JOIN tableName2 t2 ON t2.id = t1.id 
    SET t1.lpEntityType2 = t2.lpEntityType2 

update A m,B mp set m.job_type = mp.job_type where mp.mobile= m.mobile;

   update B, A
    set 
        B.username = A.username,
        B.phone = A.phone
    where 
        B.userId = A.userId

update 
    B join A on B.userId=A.userId
set 
    B.username = A.username,
    B.phone = A.phone 

UPDATE m_device md,
(
SELECT
    mi.img_url AS aa,
    mi.device_id AS bb 
FROM
    m_device_img mi
    INNER JOIN m_device_type_attr ma ON ma.id = mi.device_type_attr_id 
WHERE
    ma.attr_name = '设备铭牌' 
    ) b 
    SET md.nameplate_img = b.aa 
WHERE
    md.id = b.bb 
    AND md.nameplate_img = '' and md.is_deleted = 0