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CREATE TABLE bdorder ( studentno varchar(10) KEY, choice varchar(02), orderdate datetime ); REPLACE INTO bdorder VALUES ('ST001', 'CL', '2021-11-25');/*訂雞腿*/ REPLACE INTO bdorder VALUES ('ST002', 'PB', '2021-11-25');/*訂排骨*/ REPLACE INTO bdorder VALUES ('ST003', 'PB', '2021-11-25');/*訂排骨*/ REPLACE INTO bdorder VALUES ('ST004', 'LP', '2021-11-25');/*兩個我都要*/ REPLACE INTO bdorder VALUES ('ST005', 'LP', '2021-11-25');/*兩個我都要*/ REPLACE INTO bdorder VALUES ('ST006', 'LP', '2021-11-25');/*兩個我都要*/ REPLACE INTO bdorder VALUES ('ST001', 'CL', '2021-11-26');/*訂雞腿*/ REPLACE INTO bdorder VALUES ('ST002', 'PB', '2021-11-26');/*訂排骨*/ REPLACE INTO bdorder VALUES ('ST003', 'LP', '2021-11-26');/*訂排骨*/
/* 統計要吃雞腿的 */ SELECT count(*) FROM bdorder WHERE orderdate=CURDATE() AND choice='CL'; /* 統計要吃排骨的 */ SELECT count(*) FROM bdorder WHERE orderdate=CURDATE() AND choice='PB'; /* 統計要吃兩個的 */ SELECT count(*) FROM bdorder WHERE orderdate=CURDATE() AND choice='LP';
count(*)
0
count(*)
0
count(*)
0