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SELECT last_name,e.department_id, department_name FROM employees e LEFT OUTER JOIN departments d ON ...0229 -
1.avg/sum:只适用于数值类型的字段或变量 SELECT AVG(salary),SUM(salary) from employees; 字符串求和没有任何意义 SELECT AVG(last_...0230 -
练习SELECT e.last_name,d.department_id,d.department_name FROM employees e,departments d WHERE e.depart...0153
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满外连接(mysql不支持使用FULL OUTER JOIN) SELECT employees_id,department_name FROM employees e FULL OUTER JOIN...1171
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SELECT employees_id,department_name FROM employees e 满外连接 SELECT EMPLOYEE_id,department_name FROM em...2164
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满外链接 MYSQL不支持FULL OUTER JOIN 做满外链接 SELECT employee_id,department_name FROM employees e FULL OUTER ...0163
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满外查询 错误写法(MySQL不支持FULL OUTER JOIN 做满外查询 ) SELECT employee_id,department_name FROM employees e FULL...0147
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select 122106; Mysql 不支持full outer join 做满外查询 select employee_id,department_name from employees e fu...0169
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满外连接 MySQL不支持FULL OUTER JOIN 做满外查询 SELECT employee_id,department_name FROM employees e FULL OUTER j...0162
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（一）SELECT last_name, e.department_id, department_name FROM employees e LEFT OUTER JOIN departments d...0805 -
SELECT employee_id,department_name FROM employees e left JOIN departments d ON e.department_id d.de...0162
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满外连接 MySQL不支持 FULL OUTER JOIN 做满外连接 select from employees; select employee_id,department_name fro...0162
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SELECT employee_id,department_name from employees e right JOIN departments d on e.department_idd.dep...0169
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