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mysql sql statement - SQL INSERT INTO SELECT

Posted on 2016-10-20
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Last Modified: 2016-10-20
I have a table named table1 which has the names of customers inside.
In table1 and table2 I have unique customer id which I can use when I copy customer names,

I want to copy all the names from table1 into table2 with the related customer id?

how should I write the sql statement?
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Question by:Braveheartli
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11 Comments
 
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Author Comment

by:Braveheartli
ID: 41851586
I have a unique id on the both table : customerid
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Expert Comment

by:Ryan Chong
ID: 41851588
use Update if the customer Id already exists in table2

use Insert into if the customer id not exists in table2
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Expert Comment

by:skullnobrains
ID: 41851592
something like this should do if and only if your customer_id field is unique in the destination table2

insert into table2 select customer_id, customer_name from table1 on duplicate key update customer_name = VALUES (customer_name)

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---

if you don't have the index, try something like this

lock database

create table temp as select table2.*,table1.customer_name from table2 inner join table1 on table1.customer_id =  table2.customer_id

rename table2 to t , temp to table2

drop table t

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Expert Comment

by:Ryan Chong
ID: 41851595
for update:

Update table2 a
inner join table1 b
on a. customerid = b.customerid
set a.customername = b.customername

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for insert:

Insert into table2 (customerid, customername)
select a.customerid, a.customername
from table1 a left join table2 b
on a.customerid = b.customerid
where b.customerid is null

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code not tested, pls customize accordingly.
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Author Comment

by:Braveheartli
ID: 41851612
Dear Ryan Chong,
what does a mean? I mean what is table2 a?
a = column?
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Expert Comment

by:Ryan Chong
ID: 41851617
nope, a is the alias of the table.

we can write:
 table2 a

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as
 table2 as a

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Expert Comment

by:skullnobrains
ID: 41851632
did you try using the "on duplicate key update" way ? unless there is something not workable, it is the only way to do it in a single query
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Author Comment

by:Braveheartli
ID: 41851639
Dear skullnobrains, Ryan Chong

I'm sorry, I couldn't manage it..

My actual table name is "bayibilgileriiki" which has the data of the customer names.
and the a column name is "adi"

I want to copy "adi" coloumn to "KullaniciBilgileriiki" table's "isim" column.
"isim" column is now NULL.

I have unique customer id on both tables which coloumn name is "uid" for both of them

could you help me please?
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Accepted Solution

by:
Ryan Chong earned 500 total points
ID: 41851649
you should able to do an update like this?

Update KullaniciBilgileriiki a
inner join bayibilgileriiki b
on a.uid= b.uid
set a.isim = b.adi

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let me know if you got any syntax error, etc
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Author Closing Comment

by:Braveheartli
ID: 41851653
thank you
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Expert Comment

by:skullnobrains
ID: 41851664
just for reference since you already got a working solution

insert into KullaniciBilgileriiki ( uid , isim ) select uid,adi from bayibilgileriiki on duplicate key update isim = VALUES (isim)
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