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[英]How to extract data from two tables using SQL object relational statement in oracle 11g
[英]Delete data from two tables by using join condition in Oracle 11g
DELETE tbemp.emp_id,
tbadd.emp_id
FROM TBEMPLOYEE tbemp
JOIN TBADDRESS tbadd ON (tbemp.emp_id=tbadd.emp_id)
Oracle 11g 不会编译它
此删除语句在 Oracle 中无效。 还有其他要删除的语句,一个可以是
DELETE FROM TBEMPLOYEE tbemp
WHERE EXISTS (select 'x'
from TBADDRESS
where tbemp.emp_id=tbadd.emp_id);
您不能通过连接直接从多个表中删除。
但是您可以使用ON DELETE CASCADE
强制执行外键约束。
ALTER TABLE tbaddress ADD CONSTRAINT fk_emp FOREIGN KEY (emp_id) REFERENCES tbemployee (emp_id) ON DELETE CASCADE;
DELETE FROM tbemployee; -- This also deletes referencing keys from tbaddress
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