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SQL合并两个表的数据
shooinSQL 合并两个表的数据
1.通过共同的field value
小学数学试卷display the first name and last name of employees working for the department which allotment amount is more than 50000. lf join?
SELECT emp_fname,emp_lname
FROM emp_details e1,emp_department e2 #combine two tables together
contactsprovider
意义英文p_dept=e2.dpt_codehelen of troy
去新加坡留学怎么样>雅思听力真题词汇AND dpt_allotment >50000;;
2.joins
SELECT emp_fname, emp_lname
FROM emp_details as e1
INNER JOIN emp_department as e2
p_dept=e2.dpt_code
WHERE dpt_allotment > 50000;
3.subquery
SELECT emp_fname, emp_lname
FROM emp_details
WHERE emp_dept IN
(SELECT dpt_code
FROM emp_department
WHERE dpt_allotment > 50000);
4.UNION,UNION ALL
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lighter是什么意思combine column data
similar skema
