SQLite是否具备表/视图命名的Schema概念？能否支持类似SQL Server的Schema写法？

Hi Dave,

Great question! Let me break this down clearly for you:

SQLite does support schema-qualified table names similar to SQL Server's dbo.Employee.FirstName syntax, but there are a few key differences and requirements to keep in mind:

• Using CREATE SCHEMA to create a namespace:
  You can explicitly create a schema (a named namespace) with the CREATE SCHEMA command, then create tables under it. For example:

  -- Create the dbo schema if it doesn't exist
  CREATE SCHEMA IF NOT EXISTS dbo;
  -- Create a table under the dbo schema
  CREATE TABLE dbo.Employee (FirstName TEXT, LastName TEXT);
  -- Query using the fully qualified name
  SELECT dbo.Employee.FirstName FROM dbo.Employee;
  

  This works exactly like the syntax you're familiar with from SQL Server, letting you reference tables with schema.table.column.

• Using attached databases as schemas:
  SQLite also lets you attach external databases, which act like schemas in practice. For example:

  -- Attach another database file and alias it as dbo
  ATTACH DATABASE 'employee_db.db' AS dbo;
  -- Now you can query tables from the attached database using the alias
  SELECT dbo.Employee.FirstName FROM dbo.Employee;
  

  This is a common pattern when working with multiple datasets in SQLite.

• Default behavior without schemas:
  If you don't create a schema or attach a database, SQLite will use the default "main" schema (for the primary database file). In this case, you only need to use Employee.FirstName since there's no explicit schema name to include.

The reason you might not have seen explicit confirmation is that SQLite's schema system is more flexible than SQL Server's—instead of a fixed default schema like dbo, it lets you define your own or use attached databases. But rest assured, the syntax you're asking about is supported when you set up the schema correctly.

内容的提问来源于stack exchange，提问作者David Thielen