var
sql1，str：string；
count：float
begin
adoquery1.close;
adoquery1.sql.text := 'select count(*) from a';
adoquery1.open;
count := adoquery1.fields[0].asinteger; ///////这里
end;
c
let select_sql = select_sql||" from table_name"
execute immediate select_sql;
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