
JOIN
In
the
next
example,
the
@
sign
asso
ciated
with
SETB
requires
that
an
@
b e
asso
ciated
with
SETC.
The
@
asso
ciated
with
SETC
requires
that
an
@
b e
asso
ciated
with
SETD
if
SETD
w
as
joined
to
another
data
set.
Since
SETD
is
not
connected
to
another
data
set,
no
@
sign
is
asso
ciated
with
it.
>JOIN
SETA.ITEM1
TO
SETB.ITEM2,&
>>
SETB.ITEM2
@
TO
SETC.ITEM3,&
>>
SETC.ITEM4
@
TO
SETD.ITEM5
Example
3
In
this
example,
the
@
signs
asso
ciated
with
SETB
require
@
signs
to
b e
asso
ciated
with
b oth
SET
A
and
SETC
when
these
data
sets
are
connected
with
other
data
sets.
Only
SETC
has
an
additional
connection
and
requires
an
@
sign.
>JOIN
SETA.ITEM1
TO
@
SETB.ITEM2,&
>>
SETB.ITEM1
@
TO
SETC.ITEM2,&
>>
SETC.ITEM1
@
TO
SETD.ITEM4
Example
4
In
the
equiv
alence
b et
w
een
SET
A
and
SETB,
SET
A
has
the
@
sign
asso
ciated
with
it.
Therefore,
ev
ery
time
SETB
is
connected
to
another
data
set,
an
@
m
ust
b e
asso
ciated
with
it.
This
accoun
ts
for
the
t
w
o
@
signs
asso
ciated
with
SETB.
SETD
m
ust
also
ha
v
e
an
@
sign
b ecause
of
its
connection
with
SETB.
SETC
and
SETE
are
not
required
to
ha
v
e
asso
ciated
@
signs
b ecause
they
ha
v
e
no
further
connections.
>JOIN
SETA.ITEM1
@
TO
SETB.ITEM2,&
>>
SETB.ITEM3
@
TO
SETC.ITEM2,&
>>
SETB.ITEM4
@
TO
SETD.ITEM1,&
>>
SETD.ITEM2
@
TO
SETE.ITEM3
QUERY/V
COMMANDS
3-63
Summary of Contents for QUERY
Page 10: ......
Page 17: ...Figure 1 1 ORDERS Data Base Structure Figure 1 2 Sample Entry Values INTRODUCING QUERY V 1 7 ...
Page 20: ...Figure 1 3 IMAGE QUERY Environments 1 10 INTRODUCING QUERY V ...
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Page 165: ...REPORT G1 GROUP TITLE 11 END QUERY V COMMANDS 3 129 ...
Page 199: ...XEQ TF TOTAL DUE 9 SPACE B2 SKIP A TF R0 70 E2 S PURCH DATE END QUERY V COMMANDS 3 163 ...
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Page 279: ...G ASCII CHARACTER SET This appendix is not available in this edition ASCII CHARACTER SET G 1 ...
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