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COUNT(条件) COUNT(*) MIN(<字段>) AVG(<字段>)
COUNT(AL COUNT(*) COUNT(成绩) COUNT(DISTINCT学号)
fwrite(buffer,count,size,fp); fwrite(fp,size,count,buffer); fwrite(fp,count,size,buffer); fwrite(buffer,size,count,fp);
COUNT(AL COUNT(*) COUNT(成绩) COUNT(DISTINCT学号)
SUM() COUNT(列名) COUNT(*) AVG()
TOTAL SUM() COUNT() COUNT
COUNT() COUNT AVG() SUM()
fwrite(buffer,count,size,f; fwrite(fP,size,count,buffe; fwrite(fp,count,size,buffe; fwrite(buffer,size,count,f;
COUNT(ALL) COUNT(*) COUNT(成绩) COUNT(DISTINCT学号)
COUNT(ALL) COUNT(*) COUNT(成绩) COUNT(DISTINCT学号)
AVG() SUM() COUNT() COUNT
fwrite(buffer,count,size,fp); fwrite(fP,size,count,buffer); fwrite(fp,count,size,buffer); fwrite(buffer,size,count,fp);
fwrite(buffer,count,size,f; fwrite(fp,size,count,buffe; fwrite(fp,count,size,buffe; fwrite(buffer,size,count,f;
fwrite(buffer,count,fp,siz; fwrite(fp,size,count,buffe; fwrite(fp,count,size,buffe; fwrite(buffer,size,count,f;
fwrite(buffer,count,fp,size); fwrite(fp,size,count,buffer); fwrite(fp,count,size,buffer); fwrite(buffer,size,count,fp);