complex update on three tables

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i have 3 tables like

table A//user
Aid(pk) content locked

table B//article
Bid(pk) Aid(fk) content locked

table C//comment
Cid(pk) Bid(fk) content locked

i want to update the column locked value as 1
where Aid=xx (tableA)

in tableB
all Aid column with matching value xx then locked value as 1

in tableC
all Bid column with affected tableB then locked value as 1

pk-- primary key
fk-- foreign key

thanks in advance

Posted 30-Nov-12 21:39pm

mohanrajkiller

Updated 30-Nov-12 22:34pm

v3

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__TR__ · Accepted Answer · 2012-11-30T21:52:00

Solution 1

Quote:
i want to update the column locked value as 1
where Aid=xx (tableA)

SQL

UPDATE tableA
SET locked = 1
WHERE Aid = [some value]

Quote:
in tableB
all Aid column with matching value xx then locked value as 1

SQL

UPDATE tableb, tablea
SET tableb.Locked = 1
WHERE tablea.Aid = tableb.Aid and tablea.Aid = [some value]

Quote:
in tableC
all Bid column with affected tableB then locked value as 1

SQL

UPDATE tableb, tablea,tablec
SET tablec.Locked = 1
WHERE tablea.Aid = tableb.Aid 
and tableb.Bid = tablec.Bid
and tablea.Aid = [some value]

You can also take a look at the below links
Mastering the SQL UPDATE Statement[^]
UPDATE Basics in SQL Server[^]

Hope this helps.

Posted 30-Nov-12 21:52pm

__TR__

Updated 30-Nov-12 23:53pm

v3

Comments

mohanrajkiller 1-Dec-12 3:55am

is that possible to do all in one query

__TR__ 1-Dec-12 4:28am

You cannot update multiple tables in a single update statement. However you can use transactions so that if any of the update statement fails everything gets roll backed.

mohanrajkiller 1-Dec-12 4:34am

can you convert this for mysql

__TR__ 1-Dec-12 5:53am

Updated the solution for MsSQL.

mohanrajkiller 1-Dec-12 6:03am

works thanks can you answer my next question :(