If table exists mysql

How do I drop a table in MySQL? How to check if MySQL database exists? If there is a row in the et, table exists. Steve The third option is not portable. SergioTulentsev Regardless of the tag I prefer the portable way to the proprietary way.

Check if MySQL table exists or not - Stack. You can use your programming language of choice to connect to the database, run a query like the above and then check if there are any rows to see if the table exists. The exists condition can be used with subquery. It returns true when row exists in the table , otherwise false is returned.

True is represented in the form of and false is represented as 0. For better understanding,. It is really interesting to see MySQL already having this feature for a while, whereas SQL Server just introduced this feature in this year. I tried many things but none worked.

How can I do this with MySQL ? If the customerNumber, which appears in the customers table , exists in the orders table , the subquery returns the first matching row. As a result, the EXISTS operator returns true and stops examining the orders table. Otherwise, the subquery returns no row and the EXISTS operator returns false. This MySQL EXISTS condition example will return all records from the customers table where there is at least one record in the order_ details table with the matching customer_id.

TIP: Before you start creating A TABLE , It is always advisable to check if a Table exists , or not. In your first query write: CREATE TABLE IF NOT EXISTS `table1`. Then write to that table in your second query. What sort of backup process are you using?

To answer the question, the MySQL statement should fail and I know of. The DROP DATABASE IF EXISTS , DROP TABLE IF EXISTS , and DROP VIEW IF EXISTS statements are always replicate even if the database, table , or view to be dropped does not exist on the master. Let us verify the concept. The table name DemoTable is already present. Table created successfully above since it does not already exist.

If it is true (not equal to false), then the table exists. If you want have the have the table name stored as a variable, the only thing that changes is instead of putting the name of the table name directly into the mysql _query, you would put the variable name in its place. Function to check if one ore multiple tables exist in a database The following function can be used in PHP to see if one, or multiple tables exists in a MySQL database.

This is a very quick to way to check. If this returns no rows, then your table does not exist. Even if the table exists , but your MySQL account does not have privilege to read that table , it will appear to be missing from information_schema.

But all accounts do have the privilege to query information_schema. Now I’d like to add some supplements to John’s reply. Approach 1: Using INFORMATION_SCHEMA. We can write a query like below to check if a Customers Table exists in the current database. The IF NOT EXISTS is optional.

It allows you to check if the table that you create already exists in the database. If this is the case, MySQL will ignore the whole statement and will not create any new table. Secon you specify a list of columns of the table in the column_list section, columns are separated by commas.

Check the column existance with the informations of the table information_schema. By the way in general it is better excecute each single sql statement step by step (debuging is then more easier and the performance is the same).