面试时遇到的SQL记录

Posted 2021-02-21 菜鸟楚

1.mysql创建表和设置主键

 

a. CREATE TABLE db (\'id\' VARCHAR(10), \'name\' int(20), \'phone\' VARCHAR(11), \'score\' varchar(10)) PRIMARY key (\'id\');

b. select name, score from db where score in (\'100\', \'60\' \'0\');

 

2.取某一列的的前18位location：

SELECT
s1.shelf_code,
s3.length,
s3.width,
s3.height,
s3.length * s3.height * s3.width * 0.7 AS slot_V,
s3.open_face
FROM
prime_pmc.shelfs AS s1
LEFT JOIN prime_pmc.shelf_level_item AS s2 ON s1.shelf_id = s2.shelf_id
LEFT JOIN prime_pmc.shelf_item_slot s3 ON s2.level_item_id = s3.level_item_id
WHERE
s1.shelf_code NOT IN (
SELECT DISTINCT
(LEFT(location, 18))
FROM
prime_pmc.inventorys_detail
WHERE
location != \'\'
)
AND s1.level_total_num = \'2\';

 

3.

 

 

 

 select 员工Id ,部门Id,姓名,ifNULL(部门名称,未标志) from tbl_Emloy a left join tbl_Depts b on a.员工id=b.员工is；