面试时遇到的SQL记录

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；