SQL語言之DQL部分 PART1

select department_id as dashabia from hr.departments;     //別名的使用，從hr用戶下查詢departments表，將department_id命名爲dashabia並列出 SELECT last_name||' '||job_id AS "Employees" FROM employees;   //鏈接符   ||'@' || 中間用引

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