我正在尝试从多个表中选择列。这是我的代码：
SELECT
Sum(IIf((tblChain.InitialZone="1"),1,0)) AS SCCH,
tblStatHistory.HomeTeam,
Sum(IIf(([Pentagraph]="HANDB") Or ([Pentagraph]="HANBB") Or ([Pentagraph]="HBCL") Or
([Pentagraph]="KBBW") Or ([Pentagraph]="KBCL") Or ([Pentagraph]="KBIN") Or
([Pentagraph]="KBLO") Or ([Pentagraph]="KBSH") Or ([Pentagraph]="KKBW") Or
([Pentagraph]="KKCL") Or ([Pentagraph]="KKGKN") Or ([Pentagraph]="KKBW") Or
([Pentagraph]="KKGKO") Or ([Pentagraph]="KKGKP") Or([Pentagraph]="KKIN") Or
([Pentagraph]="KKLO") Or ([Pentagraph]="KKSH"),1,0)) AS D,
Sum(IIf(([Pentagraph]="KBBW") Or ([Pentagraph]="KBCL") Or ([Pentagraph]="KBIN") Or
([Pentagraph]="KBLO") Or ([Pentagraph]="KBSH") Or ([Pentagraph]="KKBW") Or
([Pentagraph]="KKCL") Or ([Pentagraph]="KKGKN") Or ([Pentagraph]="KKBW") Or
([Pentagraph]="KKGKO") Or ([Pentagraph]="KKGKP") Or ([Pentagraph]="KKIN") Or
([Pentagraph]="KKLO") Or ([Pentagraph]="KKSH"),1,0)) AS K,
Sum(IIf(([Pentagraph]="KBBW") Or ([Pentagraph]="KKBW"),1,0)) AS K_Back,
Sum(IIf(([Pentagraph]="MACOO") Or ([Pentagraph]="MACOP") Or ([Pentagraph]="MAPAO") Or
([Pentagraph]="MAPAP") Or ([Pentagraph]="MAOL") Or ([Pentagraph]="MAUNO") Or
([Pentagraph]="MAUNP"),1,0)) AS M,
Sum(IIf(([Pentagraph]="MAERO") Or ([Pentagraph]="MAERP") Or ([Pentagraph]="MAUNO") Or
([Pentagraph]="MAUC") Or ([Pentagraph]="MAUNP") Or ([Pentagraph]="MAOL"),1,0)) AS UM,
Sum(IIf(([Pentagraph]="MACOO") Or ([Pentagraph]="MACOP"),1,0)) AS CM,
Sum(IIf(([Pentagraph]="HANDB") Or ([Pentagraph]="HANBB") Or ([Pentagraph]="HBCL"),1,0)) AS H,
Sum(IIf(([Pentagraph]="CBCL") Or ([Pentagraph]="BUCL") Or ([Pentagraph]="TICL"),1,0)) AS C,
Sum(IIf(([Pentagraph]="CBCL"),1,0)) AS C_CSB,
Sum(IIf(([Pentagraph]="BUCL") Or ([Pentagraph]="TICL"),1,0)) AS C_BUTI,
Sum(IIf(([Pentagraph]="CBFP") Or ([Pentagraph]="BUFP") Or ([Pentagraph]="TIFP"),1,0)) AS FP,
Sum(IIf(([Pentagraph]="BUFP") Or ([Pentagraph]="TIFP"),1,0)) AS FP_BUTI,
Sum(IIf(([Pentagraph]="CBFP"),1,0)) AS FP_CSB,
Sum(IIf(([Pentagraph]="CBHO") Or ([Pentagraph]="BUHO") Or ([Pentagraph]="TIHO"),1,0)) AS HO,
Sum(IIf(([Pentagraph]="BUHO") Or ([Pentagraph]="TIHO"),1,0)) AS HO_BUTI,
Sum(IIf(([Pentagraph]="CBHO"),1,0)) AS HO_CSB,
Sum(IIf(([Pentagraph]="IN50"),1,0)) AS I50,
Sum(IIf(([Pentagraph]="GOAL"),1,0)) AS GOAL,
Sum(IIf(([Pentagraph]="BEHI"),1,0)) AS BHND,
Sum(IIf(([Pentagraph]="TACKN") Or ([Pentagraph]="TACKO") Or ([Pentagraph]="TACKP") Or
(([Pentagraph]="RDTDD") And ([ROLE]=1)) Or (([Pentagraph]="TACKL") And ([ROLE]=1)) Or
(([Pentagraph]="RDTAK") And ([ROLE]=1)) Or (([Pentagraph]="DISP") And ([ROLE]=1)),1,0)) AS T,
Sum(IIf(([Pentagraph]="GEHAN") Or ([Pentagraph]="GEHAO") Or ([Pentagraph]="GEHAP") Or ([Pentagraph]="GEHCN") Or ([Pentagraph]="GEHCO") Or([Pentagraph]="GEHCP") Or
([Pentagraph]="GERU") Or ([Pentagraph]="GELON") Or ([Pentagraph]="GELOO") Or ([Pentagraph]="GELOP") Or ([Pentagraph]="GELCN") Or ([Pentagraph]="GELCO") Or ([Pentagraph]="GELCP"),1,0)) AS GB
FROM
tblStatHistory
WHERE
(((tblStatHistory.Period)=IIf(:QTR1,1) Or (tblStatHistory.Period)=IIf(:QTR2,2) Or
(tblStatHistory.Period)=IIf(:QTR3,3) Or (tblStatHistory.Period)=IIf(:QTR4,4)) AND
((tblStatHistory.LogicalZone)=IIf(:ZONEF50,"F") Or (tblStatHistory.LogicalZone)=IIf(:ZONEAM,"S") Or
(tblStatHistory.LogicalZone)=IIf(:ZONEDM,"R") Or (tblStatHistory.LogicalZone)=IIf(:ZONED50,"D")) AND
((tblStatHistory.MatchID)=:GameID) AND ((tblStatHistory.PeriodSecs)>:Seconds))
GROUP BY
tblStatHistory.HomeTeam
ORDER BY
tblStatHistory.HomeTeam DESC;
第一行的这一部分是我要访问的第二个表
Sum(IIf((tblChain.InitialZone="1"),1,0)) AS SCCH
发生的情况是，如果我尝试将“SCCH”的值写入一个变量，它会吐回 SCCH 字段为空。它还会杀死其余代码的输出，报告 0 而不是查询的计数。
关于如何最好地实现这一点的任何建议？
编辑：这是原始代码
Procedure TGame.UpdateTeamStats;
var
Query: TADOQuery;
P,Z,T: integer;
begin
try
Query := TADOQuery.Create(nil);
Query.Connection := connection;
Query.Close;
Query.SQL.Add('SELECT tblStatHistory.HomeTeam, Sum(IIf(([Pentagraph]="HANDB") Or ');
Query.SQL.Add('([Pentagraph]="HANBB") Or ([Pentagraph]="HBCL") Or ([Pentagraph]="KBBW") Or ([Pentagraph]="KBCL") Or ');
Query.SQL.Add('([Pentagraph]="KBIN") Or ([Pentagraph]="KBLO") Or ([Pentagraph]="KBSH") Or ');
Query.SQL.Add('([Pentagraph]="KKBW") Or ([Pentagraph]="KKCL") Or ([Pentagraph]="KKGKN") Or ');
Query.SQL.Add('([Pentagraph]="KKBW") Or ([Pentagraph]="KKGKO") Or ([Pentagraph]="KKGKP") Or ');
Query.SQL.Add('([Pentagraph]="KKIN") Or ([Pentagraph]="KKLO") Or ([Pentagraph]="KKSH"),1,0)) AS D, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="KBBW") Or ([Pentagraph]="KBCL") Or ([Pentagraph]="KBIN") Or ');
Query.SQL.Add('([Pentagraph]="KBLO") Or ([Pentagraph]="KBSH") Or ([Pentagraph]="KKBW") Or ');
Query.SQL.Add('([Pentagraph]="KKCL") Or ([Pentagraph]="KKGKN") Or ([Pentagraph]="KKBW") Or ');
Query.SQL.Add('([Pentagraph]="KKGKO") Or ([Pentagraph]="KKGKP") Or ([Pentagraph]="KKIN") Or ');
Query.SQL.Add('([Pentagraph]="KKLO") Or ([Pentagraph]="KKSH"),1,0)) AS K, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="MACOO") Or ([Pentagraph]="MACOP") Or ([Pentagraph]="MAPAO") Or ');
Query.SQL.Add('([Pentagraph]="MAPAP") Or ([Pentagraph]="MAOL") Or ([Pentagraph]="MAUNO") Or ');
Query.SQL.Add('([Pentagraph]="MAUNP"),1,0)) AS M, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="MAERO") Or ([Pentagraph]="MAERP") Or ([Pentagraph]="MAUNO") Or ');
Query.SQL.Add('([Pentagraph]="MAUC") Or ([Pentagraph]="MAUNP") Or ([Pentagraph]="MAOL"),1,0)) AS UM, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="MACOO") Or ([Pentagraph]="MACOP"),1,0)) AS CM, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="KBBW") Or ([Pentagraph]="KKBW"),1,0)) AS K_Back, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="HANDB") Or ([Pentagraph]="HANBB") Or ([Pentagraph]="HBCL"),1,0)) AS H, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="CBCL") Or ([Pentagraph]="BUCL") Or ([Pentagraph]="TICL"),1,0)) AS C, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="CBCL"),1,0)) AS C_CSB, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="BUCL") Or ([Pentagraph]="TICL"),1,0)) AS C_BUTI, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="CBFP") Or ([Pentagraph]="BUFP") Or ([Pentagraph]="TIFP"),1,0)) AS FP, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="BUFP") Or ([Pentagraph]="TIFP"),1,0)) AS FP_BUTI, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="CBFP"),1,0)) AS FP_CSB, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="CBHO") Or ([Pentagraph]="BUHO") Or ([Pentagraph]="TIHO"),1,0)) AS HO, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="BUHO") Or ([Pentagraph]="TIHO"),1,0)) AS HO_BUTI, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="CBHO"),1,0)) AS HO_CSB, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="IN50"),1,0)) AS I50, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="GOAL"),1,0)) AS GOAL, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="BEHI"),1,0)) AS BHND, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="TACKN") Or ([Pentagraph]="TACKO") Or ([Pentagraph]="TACKP") Or ');
Query.SQL.Add('(([Pentagraph]="RDTDD") And ([ROLE]=1)) Or (([Pentagraph]="TACKL") And ([ROLE]=1)) Or ');
Query.SQL.Add('(([Pentagraph]="RDTAK") And ([ROLE]=1)) Or (([Pentagraph]="DISP") And ([ROLE]=1)),1,0)) AS T, ');
Query.SQL.Add('Sum(IIf(([Pentagraph]="GEHAN") Or ([Pentagraph]="GEHAO") Or ([Pentagraph]="GEHAP") Or ([Pentagraph]="GEHCN") Or ([Pentagraph]="GEHCO") Or([Pentagraph]="GEHCP") Or ');
Query.SQL.Add('([Pentagraph]="GERU") Or ([Pentagraph]="GELON") Or ([Pentagraph]="GELOO") Or ([Pentagraph]="GELOP") Or ([Pentagraph]="GELCN") Or ([Pentagraph]="GELCO") Or ([Pentagraph]="GELCP"),1,0)) AS GB');
Query.SQL.Add('FROM tblStatHistory');
Query.SQL.Add('WHERE (((tblStatHistory.Period)=IIf(:QTR1,1) Or (tblStatHistory.Period)=IIf(:QTR2,2) Or ');
Query.SQL.Add('(tblStatHistory.Period)=IIf(:QTR3,3) Or (tblStatHistory.Period)=IIf(:QTR4,4)) AND ');
Query.SQL.Add('((tblStatHistory.LogicalZone)=IIf(:ZONEF50,"F") Or (tblStatHistory.LogicalZone)=IIf(:ZONEAM,"S") Or ');
Query.SQL.Add('(tblStatHistory.LogicalZone)=IIf(:ZONEDM,"R") Or (tblStatHistory.LogicalZone)=IIf(:ZONED50,"D")) AND ');
Query.SQL.Add('((tblStatHistory.MatchID)=:GameID) AND ((tblStatHistory.PeriodSecs)>:Seconds))');
Query.SQL.Add('GROUP BY tblStatHistory.HomeTeam');
Query.SQL.Add('ORDER BY tblStatHistory.HomeTeam DESC;');
with Query.Parameters.AddParameter do
begin
DataType := ftinteger;
name:= 'GameID';
end;
with Query.Parameters.AddParameter do
begin
DataType := ftinteger;
name:= 'Seconds';
end;
with Query.Parameters.AddParameter do
begin
DataType := ftinteger;
name:= 'QTR1';
end;
with Query.Parameters.AddParameter do
begin
DataType := ftinteger;
name:= 'QTR2';
end;
with Query.Parameters.AddParameter do
begin
DataType := ftinteger;
name:= 'QTR3';
end;
with Query.Parameters.AddParameter do
begin
DataType := ftinteger;
name:= 'QTR4';
end;
with Query.Parameters.AddParameter do
begin
DataType := ftinteger;
name:= 'ZONEF50';
end;
with Query.Parameters.AddParameter do
begin
DataType := ftinteger;
name:= 'ZONEAM';
end;
with Query.Parameters.AddParameter do
begin
DataType := ftinteger;
name:= 'ZONEDM';
end;
with Query.Parameters.AddParameter do
begin
DataType := ftinteger;
name:= 'ZONED50';
end;
Query.Parameters.ParamByName('GameID').Value := GameID;
for P := 0 to 4 do
begin
if updatePeriodCheck(p) then
begin
for Z := 0 to 7 do
begin
SetParameters(P,Z,0,Query.Parameters);
Query.Open;
Query.First;
for T := 0 to 3 do
begin
if T = 1 then Query.Next;
if T < 2 then
Stats[P,Z].Team[T] := PopulateStatsRecord(Query)
else if T = 2 then // Difference
Stats[P,Z].Team[T] := SubtractStatsRecords(Stats[P,Z].Team[1],Stats[P,Z].Team[0])
else if T=3 then begin // Difference Z v Z
if Z = 0 then
Stats[P,Z].Team[T] := Stats[P,Z].Team[2]
else if Z = 1 then
Stats[P,Z].Team[T] := SubtractStatsRecords(Stats[P,1].Team[1],Stats[P,4].Team[0])
else if Z = 2 then
Stats[P,Z].Team[T] := SubtractStatsRecords(Stats[P,2].Team[1],Stats[P,3].Team[0])
else if Z = 3 then
Stats[P,Z].Team[T] := SubtractStatsRecords(Stats[P,3].Team[1],Stats[P,4].Team[0])
else if Z = 4 then
Stats[P,Z].Team[T] := SubtractStatsRecords(Stats[P,4].Team[1],Stats[P,1].Team[0])
else if Z = 5 then
Stats[P,Z].Team[T] := Stats[P,Z].Team[2]
else if z = 6 then
Stats[P,Z].Team[T] := SubtractStatsRecords(Stats[P,6].Team[1],Stats[P,7].Team[0])
else if z = 7 then
Stats[P,Z].Team[T] := SubtractStatsRecords(Stats[P,7].Team[1],Stats[P,6].Team[0]);
end;
end;
Query.Close;
end;
end;
end;
finally
Query.Free;
end;
end;