Sqlite Rowid Vs Primary Key, On an INSERT, if the ROWID or INTEGER SQLite tables without an explicit INTEGER PRIMARY KEY column automatically get a special column named ROWID. The Basics of ROWID Every row in a SQLite table has a unique identifier known as a ROWID unless explicitly defined otherwise. A field with autoincrement would be safer, but a virtual rowID may CHANGE; for example, if you delete rows and do a VACUUM, the SQLite provides two mechanisms for adding unique identifiers to rows: AUTOINCREMENT and ROWIDs. So will the returning rowId be same as the primary key. (WITHOUT ROWID tables are the exception. Worth adding to Keith's excellent answers, the behaviour of things like VACUUM. How this rowid RowID without a field, maps to the physical row number. While they may seem similar, they serve different purposes and have distinct behaviors. But what if a row is deleted and another row is inserted in that When int primary key is used, I got sqlite_autoindex thing generated; when integer primary key , I got sqlite_sequence table generated. But WITHOUT ROWID tables do follow the standard and will throw an error on While ROWID -based tables offer significant benefits in most scenarios, such as fast primary key lookups and efficient indexing, they can sometimes introduce unnecessary overhead SQLite PK implementation SQLite table's primary key explained SQLite documentation maze Being a long term fan of SQLite database I have always been a little bit disoriented by its documentation This tutorial shows you how to use SQLite PRIMARY KEY constraint to define the primary key for a table. The PRIMARY KEY constraint for a rowid table (as long as it is not the true primary key or INTEGER PRIMARY KEY) is really the same thing as a UNIQUE constraint. The PRIMARY KEY constraint for a rowid table (as long as it is not the true primary key or INTEGER PRIMARY KEY) is really the same thing as a UNIQUE constraint. If you have no reference to rowid when you create the table, SQLite concludes that rowid is for internal use only, Using a rowid field lets you make any changes to the structure of the table and the data in the table at any time without messing up the primary key. This column is a 64-bit signed integer and uniquely identifies each row. You gain nothing by NOT specifying a primary key, the insert mechanics remain. It's basically theory vs real world. By default, SQLite tables have a special rowid column that uniquely identifies each row. Thus, there is no requirement to have an explicitly In SQLite, a column with type INTEGER PRIMARY KEY is an alias for the ROWID (except in WITHOUT ROWID tables) which is always a 64-bit signed integer. This post gives an overview of By default, SQLite tables have a special rowid column that uniquely identifies each row. Because it is not a true primary In SQLite, table rows normally have a 64-bit signed integer ROWID which is unique among all rows in the same table. Assigning primary key values using auto increment or using a row id is convenient but can result in slower performance and issues in connecting tables. All these names are aliases for one another and work equally well in any context. While often useful, both should So, ordinary rowid tables in SQLite violate the SQL standard and allow NULL values in PRIMARY KEY fields. 185 When an integer column is marked as a primary key in an SQLite table, should an index be explicitly created for it as well? SQLite does not appear to automatically create an index for a primary key If I have a non-integer primary-key the rowid is an auto-increment starting at 1. Instead, I've been using the built-in ROWID as one. It’s present in most tables, but generally hidden from view. sqlite> create table t1 (name text, documentid integer, primary key (name)); sqlite> insert into t1 (name, I have a large table without a primary key. How this rowid column behaves is The special "INTEGER PRIMARY KEY" column type in ordinary SQLite tables causes the column to be an alias for the rowid, and so an INTEGER PRIMARY KEY is a true PRIMARY KEY. ) If a table contains a column of type SQLite has the concept of a rowid. A special column with a unique integer identifier for each row. Problem: now I can't VACUUM my database, because: The VACUUM command may change the ROWIDs of Consider my questions as from an Oracle DBA with no sqlite experience at all, trying to adopt. This rowid exists even if you have a user-specified PRIMARY KEY on the table. what's the difference? what side effects can have the first and This tutorial helps you understand SQLite AUTOINCREMENT attribute and explain when you should use it in the primary key of a table. The ROWID is a 64-bit signed integer, automatically created by SQLite If you don’t want to read the whole post then just do this: Every time you create a table with sqlite make sure to have an INTEGER PRIMARY KEY AUTOINCREMENT column (the rowid column will be an Yes, I'm pretty sure - for (x,y) and for the additional rowid as well; from the docs: "In most cases, UNIQUE and PRIMARY KEY constraints are implemented by creating a unique index in the Row IDs as Implicit Primary Keys When creating a table, SQLite adds an automatic column called rowid (also accessible by the aliases _rowid_ and oid). Given my example there is a . mfg8wm, tq0b, cbloz, 1ei1, xigc8, ch6lj, 2kvc, xu4il, 0rtd, ygn7,