[SQL] Last insert id

[mixo]

I have three tables which are related a serial field, table1_id, in on 
of the tables. Updating the tables is done through a transaction. My 
problem is, once I have insert  a row in the first tables with 
table1_id, I need for the other two tables. How can I get this? Is it 
safe to use "select max(table1_id) from table1" after the insert?

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