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update based in select

Posted on 2013-01-29
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Last Modified: 2013-01-30
Hello Guys,

I have 2 tables and I need to mount an update based on the results of a select. example:

Table1
name, phone, record, age

Table2
name, phone, record, age

Both tables have the same structure. I would like to check if customers table1 exists in table2 if there is an update to make updating the data from table1 to table2
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Question by:eduardo12fox
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Expert Comment

by:AielloJ
ID: 38833590
eduardo12fox,


INSERT INTO table2 (name, phone, record, age)
SELECT name, phone, record, age
FROM table1
WHERE (name, phone, record, age) NOT IN
       (SELECT name, phone, record, age
        FROM table2);

Best regards,

AielloJ
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Accepted Solution

by:
johanntagle earned 2000 total points
ID: 38833765
You want to update if there are common records, not insert new records, right?  Assuming the name column is the unique identifier:

update table2 t2 join table1 t1 on t2.name=t1.name
set t2.phone=t1.phone, t2.record=t1.record, t2.age=t1.age;

If you want to both update existing and insert those in table1 that are not in table2:

1.  Make sure name column is either primary key or has unique index.
2. Execute:

replace into table2 (name, phone, record, age)
select name, phone, record age from table1;

See http://dev.mysql.com/doc/refman/5.5/en/replace.html for more info on the REPLACE keyword.
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Author Closing Comment

by:eduardo12fox
ID: 38834821
Thank you
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