
JOIN
>JOIN
SETA.ITEM1
TO
@
SETB.ITEM2,&
>>
SETB.ITEM3
TO
@
SETC.ITEM3,&
>>
SETC.ITEM2
TO
@
SETA.ITEM2
When
joining
three
or
more
data
sets,
the
@
parameter
m
ust
b e
propagated.
An
y
data
item
equiv
alence
naming
a
data
set
on
the
opp osite
side
of
the
TO
from
the
@
parameter
m
ust
also
ha
v
e
an
@
sign
asso
ciated
with
it,
and
the
@
m
ust
b e
on
the
same
side
of
the
TO
as
that
data
set.
Propagating
@
Signs
Example
1
In
this
example,
an
@
sign
is
asso
ciated
with
SET
A
in
the
equiv
alence
b et
w
een
SET
A
and
SETB.
Therefore,
the
data
set
on
the
opp osite
side
of
the
TO
from
the
@
sign
(SETB)
m
ust
also
ha
v
e
an
@
sign
asso
ciated
with
it.
The
@
sign
asso
ciated
with
SETB
requires
that
@
sign
b e
asso
ciated
with
SETC.
The
@
sign
asso
ciated
with
SETC
requires
that
an
@
sign
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
necessary
.
>JOIN
SETA.ITEM1
@
TO
SETB.ITEM2,&
>>
SETB.ITEM3
@
TO
SETC.ITEM4,&
>>
SETC.ITEM5
@
TO
SETD.ITEM6
Example
2
3-62
QUERY/V
COMMANDS
Содержание QUERY
Страница 10: ......
Страница 17: ...Figure 1 1 ORDERS Data Base Structure Figure 1 2 Sample Entry Values INTRODUCING QUERY V 1 7 ...
Страница 20: ...Figure 1 3 IMAGE QUERY Environments 1 10 INTRODUCING QUERY V ...
Страница 36: ......
Страница 165: ...REPORT G1 GROUP TITLE 11 END QUERY V COMMANDS 3 129 ...
Страница 199: ...XEQ TF TOTAL DUE 9 SPACE B2 SKIP A TF R0 70 E2 S PURCH DATE END QUERY V COMMANDS 3 163 ...
Страница 200: ......
Страница 244: ......
Страница 278: ......
Страница 279: ...G ASCII CHARACTER SET This appendix is not available in this edition ASCII CHARACTER SET G 1 ...
Страница 280: ......