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MySQL Display database or table: Show databases;//can then use database_name; Show tables; MySQL Change table name: ALTER TABLE table_name rename new_t; MySQL Add columns: ALTER TABLE table_name ADD column c_n column attributes; MySQL Delete
The difference between null and null values Let's first understand what the difference between a MySQL hollow value and a null is. Some children who have just come in contact with MySQL often mistakenly assume that Null is the same as the empty
Ysql provides us with delete and TRUNCATE statements to delete data. Definition of DELETE statement: Children who often work with databases, delete the data most of the time with the DELETE statement. Now let's take a look at the definition of the
A useful common statement. MySQL Display database or table: The following are the referenced contents:Show databases;//can then use database_name;Show tables; MySQL Change table name: ALTER TABLE table_name rename new_t; MySQL Add columns: