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sql,SELECT a.*,F(xiàn)ROM table1 a, table2 b, table3 c,WHERE a.id = b.id AND b.id = c.id;,“在Oracle數(shù)據(jù)庫中,查詢?nèi)齻€(gè)表的重復(fù)數(shù)據(jù)可以使用以下步驟:

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1、創(chuàng)建表結(jié)構(gòu):
我們需要創(chuàng)建三個(gè)表來存儲數(shù)據(jù),假設(shè)我們有以下表結(jié)構(gòu):
表A(id, name, age)
表B(id, address, phone)
表C(id, email, salary)
2、插入數(shù)據(jù):
接下來,我們可以向這三個(gè)表中插入一些示例數(shù)據(jù),以下是插入數(shù)據(jù)的示例代碼:
“`sql
插入表A的數(shù)據(jù)
INSERT INTO table_a (id, name, age) VALUES (1, ‘John’, 30);
INSERT INTO table_a (id, name, age) VALUES (2, ‘Alice’, 25);
INSERT INTO table_a (id, name, age) VALUES (3, ‘Bob’, 28);
插入表B的數(shù)據(jù)
INSERT INTO table_b (id, address, phone) VALUES (1, ‘Address A’, ‘123456789’);
INSERT INTO table_b (id, address, phone) VALUES (2, ‘Address B’, ‘987654321’);
INSERT INTO table_b (id, address, phone) VALUES (3, ‘Address C’, ‘456789123’);
插入表C的數(shù)據(jù)
INSERT INTO table_c (id, email, salary) VALUES (1, ‘[email protected]’, 5000);
INSERT INTO table_c (id, email, salary) VALUES (2, ‘[email protected]’, 6000);
INSERT INTO table_c (id, email, salary) VALUES (3, ‘[email protected]’, 7000);
“`
3、查詢重復(fù)數(shù)據(jù):
現(xiàn)在,我們可以使用SQL語句來查詢這三個(gè)表中的重復(fù)數(shù)據(jù),以下是查詢重復(fù)數(shù)據(jù)的示例代碼:
“`sql
查詢表A和表B中的重復(fù)數(shù)據(jù)(基于id字段)
SELECT a.id, a.name, a.age, b.address, b.phone
FROM table_a a, table_b b
WHERE a.id = b.id;
查詢表A和表C中的重復(fù)數(shù)據(jù)(基于id字段)
SELECT a.id, a.name, a.age, c.email, c.salary
FROM table_a a, table_c c
WHERE a.id = c.id;
查詢表B和表C中的重復(fù)數(shù)據(jù)(基于id字段)
SELECT b.id, b.address, b.phone, c.email, c.salary
FROM table_b b, table_c c
WHERE b.id = c.id;
“`
這些查詢語句將返回每個(gè)表中重復(fù)數(shù)據(jù)的記錄,你可以根據(jù)需要修改查詢條件和選擇的字段,請注意,上述示例中使用了簡單的JOIN操作來連接表,并使用WHERE子句來過濾重復(fù)的記錄。
本文題目:Oracle數(shù)據(jù)庫中三個(gè)表的重復(fù)數(shù)據(jù)查詢
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