transfer of constraint in CREATE TABLE as subquery

I tried to create a table of subquery that involves the join operation. tables:
create table t1(
col1 number
,col2 number
,col3 varchar2(50) not null
,constraint ck check(col2>col1)
)
create table t2(
col1 number
,col2 number
,col3 varchar2(100) not null
,constraint ck1 check(col2l>100)
)
create table composite as select * from t1 left join t2 using(col1,col2)
I checked the constraints trained in composite table and only the stress level in t1.col3 attribute is copied. What about other constraints? are they excluded because they are forced to table level? Thank you

Published by: 801264 on November 27, 2010 04:07

NOT only the constraints apply NULL to the DEC and even they are applied according to the type of join or / and expression. In your case t2.col3 of column is NOT NULL, however, the corresponding column in the composite table would be NULL since LEFT JOIN implies a null value when no match on col1 is found. Same way any expression against t1.col3 would result in a column that can be null in the composite table.

SY.

Tags: Database

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                                    END
                                 )
);

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insert into mytable values (9 ,2,4,12);
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3     1     3     11
4     1     4     23
5     1     5     14
6     2     1     50
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8     2     3     13
9     2     4     12
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12    3     2     7
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14    3     4     23
15    3     5     14
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17    4     2     41
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SQL > SELECT * FROM mytable ORDER BY col_a;

               COL_A                COL_B                COL_C                COL_D
-------------------- -------------------- -------------------- --------------------
                   1                    1                    1                   15
                   2                    1                    2                    7
                   3                    1                    3                   11
                   4                    1                    4                   23
                   5                    1                    5                   14
                   6                    2                    1                   50
                   7                    2                    2                   41
                   8                    2                    3                   13
                   9                    2                    4                   12
                  10                    2                    5                   19
                  11                    3                    1                   15
                  12                    3                    2                    7
                  13                    3                    3                   11
                  14                    3                    4                   23
                  15                    3                    5                   14
                  16                    4                    1                   54
                  17                    4                    2                   41
                  18                    4                    3                   22
                  19                    4                    4                   24
                  20                    4                    5                   17

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