<s>
Power	B-Operating_System
Query	I-Operating_System
is	O
an	O
ETL	O
tool	O
created	O
by	O
Microsoft	O
for	O
data	B-General_Concept
extraction	I-General_Concept
,	O
loading	O
and	O
transformation	O
,	O
and	O
is	O
used	O
to	O
retrieve	O
data	O
from	O
sources	O
,	O
process	O
it	O
,	O
and	O
load	O
them	O
into	O
one	O
or	O
more	O
target	O
systems	O
.	O
</s>
<s>
Power	B-Operating_System
Query	I-Operating_System
is	O
available	O
in	O
several	O
variations	O
within	O
the	O
Microsoft	B-Application
Power	I-Application
Platform	I-Application
,	O
and	O
is	O
used	O
for	O
business	B-General_Concept
intelligence	I-General_Concept
on	O
fully	O
or	O
partially	O
self-service	O
platforms	O
.	O
</s>
<s>
It	O
is	O
found	O
in	O
software	O
such	O
as	O
Excel	B-Application
,	O
Power	B-Application
BI	I-Application
,	O
Analysis	B-Application
Services	I-Application
,	O
Dataverse	O
,	O
Power	B-Application
Apps	I-Application
,	O
Azure	B-Application
Data	I-Application
Factory	I-Application
,	O
SSIS	B-Application
,	O
Dynamics	B-Operating_System
365	I-Operating_System
,	O
and	O
in	O
cloud	O
services	O
such	O
as	O
,	O
including	O
Power	B-Application
BI	I-Application
Dataflow	O
used	O
with	O
the	O
online	O
Power	B-Application
BI	I-Application
Service	O
or	O
the	O
somehwat	O
more	O
generic	O
version	O
of	O
Microsoft	O
Dataflow	O
used	O
with	O
Power	B-Application
Automate	I-Application
.	O
</s>
<s>
ETL	O
is	O
closely	O
related	O
to	O
data	B-Application
modeling	I-Application
,	O
and	O
for	O
transformation	O
,	O
Power	B-Operating_System
Query	I-Operating_System
can	O
be	O
used	O
to	O
develop	O
a	O
logical	B-Application
data	I-Application
model	I-Application
in	O
those	O
cases	O
where	O
the	O
data	O
does	O
not	O
already	O
have	O
one	O
,	O
or	O
where	O
there	O
is	O
a	O
need	O
to	O
further	O
develop	O
the	O
data	B-Application
model	I-Application
.	O
</s>
<s>
Power	B-Operating_System
Query	I-Operating_System
was	O
included	O
as	O
an	O
additional	O
feature	O
in	O
Power	B-Operating_System
Pivot	I-Operating_System
(	O
used	O
for	O
making	O
pivot	B-Application
tables	I-Application
,	O
and	O
more	O
)	O
in	O
Excel	B-Application
2010	O
and	O
2013	O
.	O
</s>
<s>
In	O
Excel	B-Application
2016	O
,	O
the	O
function	O
was	O
renamed	O
Get	O
&	O
Transform	O
for	O
a	O
short	O
time	O
,	O
but	O
has	O
since	O
been	O
named	O
Power	B-Operating_System
Query	I-Operating_System
again	O
.	O
</s>
<s>
Power	B-Operating_System
Query	I-Operating_System
is	O
built	O
on	O
what	O
was	O
then	O
a	O
new	O
query	B-Language
language	I-Language
language	O
called	O
M	O
.	O
It	O
is	O
a	O
mashup	B-Application
language	I-Application
(	O
hence	O
the	O
letter	O
M	O
)	O
designed	O
to	O
create	O
queries	O
that	O
mix	O
together	O
data	O
.	O
</s>
<s>
It	O
is	O
similar	O
to	O
the	O
F	B-Operating_System
Sharp	I-Operating_System
programming	I-Operating_System
language	I-Operating_System
,	O
and	O
according	O
to	O
Microsoft	O
it	O
is	O
a	O
"	O
mostly	O
pure	O
,	O
higher-order	O
,	O
dynamically	O
typed	O
,	O
partially	O
lazy	O
,	O
functional	O
language.	O
"	O
</s>
<s>
Much	O
of	O
the	O
user	O
interaction	O
with	O
Power	B-Operating_System
Query	I-Operating_System
can	O
be	O
done	O
via	O
graphical	B-Application
user	I-Application
interfaces	I-Application
with	O
wizards	O
,	O
and	O
this	O
can	O
be	O
used	O
for	O
many	O
common	O
or	O
basic	O
tasks	O
.	O
</s>
<s>
A	O
Power	B-Operating_System
Query	I-Operating_System
written	O
in	O
M	O
consists	O
of	O
a	O
let	O
expression	O
where	O
data	O
and	O
expressions	O
can	O
be	O
referenced	O
between	O
each	O
other	O
,	O
and	O
an	O
in	O
expression	O
which	O
contains	O
the	O
output	O
.	O
</s>
<s>
The	O
M	O
language	O
is	O
powerful	O
and	O
is	O
sometimes	O
necessary	O
for	O
performing	O
certain	O
forms	O
of	O
queries	O
,	O
but	O
for	O
many	O
common	O
tasks	O
,	O
however	O
,	O
users	O
can	O
also	O
often	O
interact	O
with	O
Power	B-Operating_System
Query	I-Operating_System
through	O
the	O
graphical	B-Application
user	I-Application
interfaces	I-Application
without	O
directly	O
working	O
with	O
the	O
M	O
language	O
.	O
</s>
<s>
In	O
Power	B-Application
BI	I-Application
,	O
use	O
of	O
M-code	O
is	O
somewhat	O
limited	O
in	O
DirectQuery	O
,	O
as	O
opposed	O
to	O
Import	O
which	O
has	O
all	O
capabilities	O
.	O
</s>
<s>
Query	O
Folding	O
is	O
the	O
ability	O
for	O
a	O
Power	B-Operating_System
Query	I-Operating_System
to	O
be	O
transformed	O
into	O
a	O
single	O
query	O
at	O
the	O
data	O
source	O
(	O
for	O
example	O
in	O
Transact	O
SQL	O
)	O
.	O
</s>
