A query consists of one or more clauses joined by and or or.
The full format for reference to the NFL SportsDataBase is game reference:parameter.

Examples:

The query:
team=Bears and site=home
returns home games for the Bears

If no team is given then results for any team are checked.
p:points<10 and pp:points<10
returns games after a team scored fewer than 10 points the past two games.

If no game reference is given then results for the current game are checked.
points<10
returns games in which teams scored fewer than 10 points.

If no conditional is imposed then the results are grouped by the reference.
p:points
returns games grouped by all occurrences of previous points.

Multiple conditions can be imposed using a comma delimited format.
p:points<7,10,14
gives results grouped by previous points < 7, previous points < 10, and previous points < 14.

Game Reference:

t => team's stats
o => opponent's stats
p => team's previous game
op => opp's previous game
P => previous match up
n => team's next game
on => opp's next game
N => next match up

Examples:

The query:
site=home and P:points<10 and PP:points<10
returns home games where team scored fewer than 10 point the past two head-to-head match ups

Examples:

The query:
p:punts=3
returns games after a team punts 3 times

Short Cuts:

H, A, W, L, F, D, O, U, C are short cuts for home,away,win,loss,favorite,dog,over the total,under the total, and conference. As with the parameter prefixes, these can be strung together without limit.

Examples:

The query:
HF and p:HFL and pp:HFL
returns home favorites after they just lost as home favorites their last two games.

The query:
P:O and PP:O and PPP:O and PPPP:O and PPPPP:O and PPPPPP:O
returns games where teams have gone over the total their last six matchups.

In addition to the above single letter short cuts the following abbreviations are available:

ATSL - ats loss
ATSW - ats win
AWP - Away Winning Percentage
3DM - third downs made
3DA - third downs attempts
3DF - third down failures
3DP - third down conversion percentage
4DM - fourth downs made
4DA - fourth downs attempts
4DF - fourth down failures
4DP - fourth down conversion percentage
COMP - completions
CP - completion percentage
DIV - divisional game
DTD - defensive touchdowns
FD - first downs
FDP - first down percentage
FG - number of field goals
FUM - fumbles
FUML - fumbles lost
GTGA - goal to go attempted
GTGF - goal to go failed
GTGM - goal to go made
HWP - Home Winning Percentage
INC - incomplete passes
INT - interceptions
M1 - margin after the first
M2 - margin at the half
M3 - margin after the third
NDIV - non-divisional game
NOTD - non-offensive TDs
OFPL - offensive plays
OT - overtime
P1 - points in the first
P2 - points in the second
P3 - points in the third
P4 - points in the fourth
PEN - penalties
PENY - penalty yards
PFD - passing first downs
PENFD - penalty first downs
PO - playoffs
PTD - passing touchdowns
PY - passing yards
RFD - rushing first downs
RTD - rushing touchdowns
REG - regular season
RSWL - regular season wins line
RTD - rushing touchdowns
RY - rushing yards
RZA - red zone attempts
RZM - red zones made
RZF - red zone failures
S1 - points in the first
S2 - total points after the second
S3 - total points after the third
SIQ - scored in quarters - the team scored in this many quarters
STDPAPG - season-to-date pass attempts per game
STDoPAPG - season-to-date opponent's pass attempts per game
STDPC - season-to-date percent completions
STDoPC - season-to-date opponent's percent completions
STDPP - season-to-date percent passes
STDoPP - season-to-date opponent's percent passes
STDPR - season-to-date percent rushes
STDoPR - season-to-date opponent's percent rushes
STDPYPG - season-to-date passing yards per game
STDoPYPG - season-to-date opponent's passing yards game
STDRAPG - season-to-date rush attempts per game
STDoRAPG - season-to-date opponent's rush attempts per game
STDRYPG - season-to-date rushing yards per game
STDoRYPG - season-to-date opponent's rushing yards per game
STDRZP - season-to-date red zone percentage
STDoRZP - season-to-date opponent's red zone percentage
STDYPPA - season-to-date yards per passing attempt
STDoYPPA - season-to-date opponent's yards per passing attempt
STDYPRA - season-to-date yards per rushing attempt
STDoYPRA - season-to-date opponent's yards per rushing attempt
SY - sack yards
TD - number of touchdowns
TO - turnovers
TOM - turnover margin
TOP - time of possession
TY - total yards
WP - winning percentage
YPC - yards per completion
YPPL - yards per play
YPPT - yards per point
YPPA - yards per pass
YPPP - yards per pass play (includes sacks)
YPRA - yards per rushing attempt