How do you create a database if not exists?

How do you create a database if not exists?

How do you create a database if not exists?

To create a database in MySQL, you use the CREATE DATABASE statement as follows:

  1. CREATE DATABASE [IF NOT EXISTS] database_name;
  2. CREATE DATABASE classicmodels;
  3. SHOW DATABASES;
  4. USE database_name;
  5. USE classicmodels;
  6. DROP DATABASE [IF EXISTS] database_name;

How do you create table if not exists in SQL?

How to create a table using “if not exists” in SQLite

  1. Use the clause “CREATE TABLE” to create a table.
  2. Write the clause “if not exists”
  3. Write the table name instead of table_name.
  4. Write the column_name.
  5. Declare the datatype, which type of data will be inserted in the column.

Is not null or exists SQL?

The IS NOT NULL condition is used in SQL to test for a non-NULL value. It returns TRUE if a non-NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

How do you use Isnull in SQL?

Definition and Usage The ISNULL() function returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression.

Is create schema same as create database?

CREATE SCHEMA is a synonym for CREATE DATABASE . An error occurs if the database exists and you did not specify IF NOT EXISTS . CREATE DATABASE is not permitted within a session that has an active LOCK TABLES statement.

What is create table if not exists?

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. Second, you specify a list of columns of the table in the column_list section, columns are separated by commas.

How do you check if a table does not exist in SQL?

Using the OBJECT_ID and the IF ELSE statement to check whether a table exists or not. Alternative 2 : Using the INFORMATION_SCHEMA. TABLES and SQL EXISTS Operator to check whether a table exists or not.

How do you say not null in SQL?

Let’s look at an example of how to use the IS NOT NULL condition in a SELECT statement in SQL Server. For example: SELECT * FROM employees WHERE last_name IS NOT NULL; This SQL Server IS NOT NULL example will return all records from the employees table where the last_name does not contain a null value.