Mysql create table if not exists. You can use the temporary keyword when creating a table. Sometimes the decision is based on business logic that cant be imposed on the whole table. Temporary tables are dropped when the your session ends. A temporary table is visible only within the current session and is dropped automatically when the session is closed.
All of the current answers to this or dupes assume that you can add a unique index. This article compares efficiency of these methods in mysql. A comparison of three methods to fetch rows present in one table but absent in another one namely not in not exists and left join is null. In this tutorial we will show you step by step how to create a new table by using mysql create table statement.
Some attributes do not apply to all data types. If the above code was executed with no errors you have successfully created a database. This question is asking how to create if it does not exists. Autoincrement applies only to integer and floating point types.
Actually this is not a duplicate of the marked question. Prior to mysql 8013 default does not apply to the blob text geometry and json types.