In SQLite, you can use the IF NOT EXISTS clause of the CREATE TABLE statement to check whether or not a table or view of the same name already exists in the database before creating it.
Creating a table without this clause would normally result in an error if a table of the same name already existed in the database. But when using the IF NOT EXISTS clause, the statement has no effect if a table already exists with the same name.
T-SQL doesn’t include the IF NOT EXISTS clause with its CREATE TABLE statement, like some other DBMSs do.
Therefore, if we want to check for the existence of the table before we create it in SQL Server, we need to use other methods.
Continue readingIn MariaDB, you can use the IF NOT EXISTS clause of the CREATE TABLE statement to check whether or not a table of the same name already exists in the database before creating it.
The table will only be created if there isn’t already one with the same name.
Continue readingIn PostgreSQL, you can use the IF NOT EXISTS clause of the CREATE TABLE statement to check whether or not a table of the same name already exists in the database before creating it.
The table will only be created if no other table exists with the same name. If a table already exists with that name, a “notice” will be issued instead of an error.
Continue readingIn MySQL, you can use the IF NOT EXISTS clause of the CREATE TABLE statement to check whether or not a table of the same name already exists in the database.
If the table doesn’t exist, it will be created. If it already exists, it won’t be created.
Continue readingCreating a SQL Server database table using T-SQL can involve a small amount of code or a large amount, depending on your requirements for the table.
In this article, I create a basic a table with T-SQL that requires a minimum amount of code.
Continue readingWhen you create a database in MongoDB, your database is basically an empty container for which you can add one or more collections to.
A collection is analogous to a table in relational databases.
In relational databases, you can use CREATE TABLE to create each table that you want in the database.
But MongoDB is not a relational database, and it stores its data as documents. Each document is stored in a collection.
This article shows you how to create a collection in MongoDB.
Continue readingThe SQL CREATE TABLE ... AS SELECT statement enables you to insert the results of a query into a new table.
The SQL SELECT INTO statement is a Sybase extension that can be used to insert the results of a query into a table (or a variable, depending on the DBMS).
The SQL INSERT statement is most commonly used to insert individual rows into a table.
But you can also insert the results of a query into a table. This means that you can insert multiple rows at once (as long as they’re returned by the query).
Continue reading