如何使用兩個表來更新數據

我在想如何計算兩列的總和並將其插入到不同的表中......我需要使用WHERE子句，它將位於增益表內的runescape_name內部。

像這樣

hitpoints_end_exp - hitpoints_starting_exp, 
magic_end_exp - magic_starting_exp, 
range_end_exp - range_starting_exp

並將結果插入到final_gains.hp_gained，final_gains.magic_gains和final_gains.range_gained

這裏是我的兩個表

收益

+------------------------+-------------+------+-----+---------+-------+ 
| Field     | Type  | Null | Key | Default | Extra | 
+------------------------+-------------+------+-----+---------+-------+ 
| runescape_name   | varchar(12) | NO | PRI | NULL |  | 
| hitpoints_starting_exp | int(50)  | NO |  | NULL |  | 
| magic_starting_exp  | int(50)  | NO |  | NULL |  | 
| range_starting_exp  | int(50)  | NO |  | NULL |  | 
| hitpoints_end_exp  | int(50)  | NO |  | NULL |  | 
| magic_end_exp   | int(50)  | NO |  | NULL |  | 
| range_end_exp   | int(50)  | NO |  | NULL |  | 
+------------------------+-------------+------+-----+---------+-------+

個final_gains

+----------------+-------------+------+-----+---------+-------+ 
| Field   | Type  | Null | Key | Default | Extra | 
+----------------+-------------+------+-----+---------+-------+ 
| runescape_name | varchar(12) | NO | PRI | NULL |  | 
| hp_gained  | int(50)  | NO |  | NULL |  | 
| magic_gained | int(50)  | NO |  | NULL |  | 
| range_gained | int(50)  | NO |  | NULL |  | 
+----------------+-------------+------+-----+---------+-------+ 
4 rows in set (0.00 sec)

很抱歉，如果我不清楚，試圖解釋最好的，因爲我可以，我希望我足夠清晰的

來源

2015-05-03 user3948234

樣本數據和期望的結果是解釋您真正想要做什麼的好方法。 –

我想這涉及到我的頭上的第一個查詢是這樣的： SELECT runescape_name，hitpoints_end_exp-hitpoints_starting_exp，magic_end_exp-magic_starting_exp，range_end_exp-range_starting_exp的差異，但我不知道該怎樣插入結果到final_gains表 – user3948234

使用INSERT，SELECT是這樣的：

INSERT INTO final_gains (runescape_name, hp_gained, magic_gains, range_gained) 
SELECT runescape_name, 
     hitpoints_end_exp - hitpoints_starting_exp, 
     magic_end_exp - magic_starting_exp, 
     range_end_exp - range_starting_exp 
    FROM gains;

爲了避免重複鍵：

INSERT INTO final_gains (runescape_name, hp_gained, magic_gains, range_gained) 
SELECT runescape_name, 
     hitpoints_end_exp - hitpoints_starting_exp, 
     magic_end_exp - magic_starting_exp, 
     range_end_exp - range_starting_exp 
    FROM gains 
    ON DUPLICATE KEY 
UPDATE hp_gained = hitpoints_end_exp - hitpoints_starting_exp, 
     magic_gains = magic_end_exp - magic_starting_exp, 
     range_gained = range_end_exp - range_starting_exp;

這是未經測試的代碼，但應該接近。

注意：我刪除了第一個建議，因爲它不適用於這些表定義。 runescape_name是表final_gains中的主鍵，所以它也必須被插入/分配。

來源

2015-05-03 14:56:03 Trinimon

想法你是對的，可能它太混亂了......我會刪除它;感謝提示:) – Trinimon

如何使用兩個表來更新數據

回答

相關問題