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Full Discussion: Query SQL get two values differents from the same columns
Top Forums Programming Query SQL get two values differents from the same columns Post 302889959 by durden_tyler on Monday 24th of February 2014 02:23:14 PM
Old 02-24-2014
Code:
SQL>
SQL> --
SQL> select * from t1;
 
       INS NAME       VALUE
---------- ---------- ----------
         1 Test       12345
         1 TestV1     12/10/2014
         8 Test       85435
         8 TestV1     11/11/2005
         9 Test       42232
         9 TestV1     19/10/2000
         6 Test       54321
         6 TestV1     11/05/2013
 
8 rows selected.
 
SQL>
SQL> --
SQL> select * from t2;
 
VALUE
----------
12345
54321
 
2 rows selected.
 
SQL>
SQL> -- Method 1
SQL> select x.value, z.value
  2    from t1 x
  3         join t2 y on (y.value = x.value)
  4         join t1 z on (z.ins = x.ins and z.name = 'TestV1')
  5  ;
 
VALUE      VALUE
---------- ----------
12345      12/10/2014
54321      11/05/2013
 
2 rows selected.
 
SQL>
SQL> -- Method 2
SQL> select x.value,
  2         y.testv1_value
  3    from t2 x
  4         join (
  5                   select ins,
  6                          max(case when name = 'Test' then value end) as test_value,
  7                          max(case when name = 'TestV1' then value end) as testv1_value
  8                     from t1
  9                    group by ins
 10              ) y
 11         on (x.value = y.test_value)
 12  ;
 
VALUE      TESTV1_VAL
---------- ----------
12345      12/10/2014
54321      11/05/2013
 
2 rows selected.
 
SQL>
SQL>

 

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LEARN ABOUT SUSE

sql::statement::term

SQL::Statement::Term(3) 				User Contributed Perl Documentation				   SQL::Statement::Term(3)

NAME

       SQL::Statement::Term - base class for all terms

SYNOPSIS

	 # create a term with an SQL::Statement object as owner
	 my $term = SQL::Statement::Term->new( $owner );
	 # access the value of that term
	 $term->value( $eval );

DESCRIPTION

       SQL::Statement::Term is an abstract base class providing the interface for all terms.

INHERITANCE

	 SQL::Statement::Term

METHODS

   new
       Instantiates new term and stores a weak reference to the owner.

   value
       Abstract method which will return the value of the term. Must be overridden by derived classes.

   DESTROY
       Destroys the term and undefines the weak reference to the owner.

NAME

       SQL::Statement::ConstantTerm - term for constant values

SYNOPSIS

	 # create a term with an SQL::Statement object as owner
	 my $term = SQL::Statement::ConstantTerm->new( $owner, 'foo' );
	 # access the value of that term - returns 'foo'
	 $term->value( $eval );

DESCRIPTION

       SQL::Statement::ConstantTerm implements a term which will always return the same constant value.

INHERITANCE

	 SQL::Statement::ConstantTerm
	 ISA SQL::Statement::Term

METHODS

   new
       Instantiates new term and stores the constant to deliver and a weak reference to the owner.

   value
       Returns the specified constant.

NAME

       SQL::Statement::ColumnValue - term for column values

SYNOPSIS

	 # create a term with an SQL::Statement object as owner
	 my $term = SQL::Statement::ColumnValue->new( $owner, 'id' );
	 # access the value of that term - returns the value of the column 'id'
	 # of the currently active row in $eval
	 $term->value( $eval );

DESCRIPTION

       SQL::Statement::ColumnValue implements a term which will return the specified column of the active row.

INHERITANCE

	 SQL::Statement::ColumnValue
	 ISA SQL::Statement::Term

METHODS

   new
       Instantiates new term and stores the column name to deliver and a weak reference to the owner.

   value
       Returns the specified column value.

AUTHOR AND COPYRIGHT

       Copyright (c) 2009,2010 by Jens Rehsack: rehsackATcpan.org

       All rights reserved.

       You may distribute this module under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl
       README file.

perl v5.12.1							    2010-05-06						   SQL::Statement::Term(3)
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