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Question about the isolation level and visible

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Hi, all,

I start two session with the following execute time order:


session1:  START TRANSACTION ISOLATION LEVEL SERIALIZABLE;

session2: INSERT INTO t1 values(1); 
session2: COMMIT;

session1: SELECT * FROM t1;

I found session1 got the value 1 which is inserted by session2.

Is there any way to make session1 not see the value session2 inserted?

For mysql, I know there is a syntax: 
START TRANSACTION WITH CONSISTENT SNAPSHOT.

I search the PG START syntax, but found none.

Any idea will be appreciated! 

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