mysql database access to common operations

1. Log MySQL
MySQL -u root -p

2. The function returns the current date and time:
LOCALTIMESTAMP () or now ()

3.删除记录
DELETE FROM table_name WHERE condition;
举例：
delete from temprature_humidity_table where date = "0000-00-00 00:00:00"

4. 插入记录
INSERT INTO temprature_humidity_table(date) VALUES(now())

The replacement recording
replace into table
column name values (expr | default ...);

6. Modify field contents
UPDATE table SET column name = Name the new value of a WHERE column name = value
if you want to change all, ignore condition.

replace into temprature_humidity_table date values ()

"INSERT INTO temprature_humidity_table(temprature, humidity) VALUES(0.3,0.311);",