下载地址:sql全国户籍地插入
sql中国56民族数据
sql中国政治面貌数据
oa人事档案学历sql
oa人事档案学位sql
oa人事档案职称等级sql
oa人事档案职称sql
oa人事档案员工类型sql
delete from hr_code where PARENT_NO='STAFF_POLITICAL_STATUS';
insert into hr_code (CODE_NO,CODE_NAME,CODE_ORDER,PARENT_NO)values
('01','中共党员','01','STAFF_POLITICAL_STATUS'),
('02','中共预备党员','02','S...
SQL基本语法(四)多表查询
多表查询
select albums.name,albums.year,artists.name from albums,artists;
SELECT * FROM albums JOIN artists ON albums.artist_id = artists.id;
SELECT * FROM albums LEFT JOIN artists ON albums.artist_id=artists.id;
select albums.name as 'Album',albums.year,artists.name as 'Artist' from albums join artists on albums.artist_id = artists.id where album...
SQL基本语法(三)计算
计数
SELECT COUNT(*) FROM table_name; 总数
select count(*) from table_name where price=0; 价格等于0的数量
select price, count(*) from table_name group by price; //Count the number of apps at each price.
select price,count(*) from table_name where column > 20000 group by price;
SELECT SUM(column) FROM table_name;
SELECT category, SUM(column) FROM fake_...
SQL基本语法(二)查询
查询
SELECT * FROM table;
SELECT column1,column2 FROM table;
SELECT DISTINCT column FROM table;
SELECT * FROM table WHERE id > 8; 其他符号(=、!=、>、<、>=、<=)
模糊查询
SELECT * FROM table where name LIKE 'Se_en'; 通配符(%)
SELECT * FROM table WHERE name LIKE '%man%';
select * from movies where name between 'A' and 'J';
select * from mov...
SQL基本语法(一)基础
基础
select * from table_name;
select id from table_name
创建数据库表
CREATE TABLE table_name(
column_1 data_type,
column_2 data_type,
column_3 data_type,
);
eg:
CREATE TABLE celebs1 (id INTEGER,name TEXT,age INTEGER);
添加一条记录
INSERT INTO table_name(id,name,age) VALUES(1,'dupeng',29);
修改一条记录
UPDATE table_name SET age = 22 where i...