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SELECT employee_id,department_name FROM employees e,departments d WHERE e.department_idd.department_...
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SELECT employee_id,department_name FROM employees,departments WHERE employees.department_iddepartmen...0313 -
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SQL92内连接： SELECT employee_id,department_name FROM employees e,departments d WHERE e.department_id d...
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SQL有两个语法规范 SQL92 SQL99 SQL92的内连接 SELECT employee_id,department_name FROM employees e,departments d ...
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SQL92内连接 SELECT e.employee_id,d.department_name from employees e,departments d where e.department_id...
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内连接 在之前写的一般都是内连接 如果想把除了内连接的显示出来，还想把其他的内容显示出来，即为外连接 外连接分为左外连接，右外连接和满外连接 外连接一般有两种语法规范 SQL92 SQL99 ...
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