sqlite row_id
Summary. The AUTOINCREMENT keyword imposes extra CPU, memory, disk space, and disk I/O overhead and should be avoided if not strictly needed. It is usually not needed. In SQLite, a column with type INTEGER PRIMARY KEY is an alias for the ROWID (except in , SELECT rowid, * FROM tbl1 WHERE letter = 'B' ..., I assume you already know a little about rowid , since you're asking about its interaction with the VACUUM command, but this may be useful information for future readers: rowid is a special column available in all tables (unless you use WITHOUT ROWID, From SQLite.org: If a table contains a column of type INTEGER PRIMARY KEY, then that column becomes an alias for the ROWID. You can then access the ROWID using any of four different names, the original three names described above or the name given to the, The insert function returns the rowid because there is no other way of determining what value was automatically generated by the database. Updates do not have this problem; the value of the whereClause parameter is already sufficient to find the records., The row_id returned by insert() is the unique identifier for the row inserted, and it's an identifier used internally by SQLite. On the other hand, you can have a column in the table that represents your business' key, declared: _id INTEGER NOT N, The documentation says that, with AUTOINCREMENT,. the ROWID chosen for the new row is at least one larger than the largest ROWID that has ever before existed in that same table. So the algorithm looks not only at the value in the sqlite_sequence table, b,The PRIMARY KEY of a rowid table (if there is one) is usually not the true primary key for the table, in the sense that it is not the unique key used by the underlying B-tree storage engine. The exception to this rule is when the rowid table declares an I, SQLite 中的每張表格裡的每一列都會有一個「ROWID」欄位，該欄位的值是64 位元的有號整數（singed integer）。在同一張表格裡的每列ROWID 值都是唯一的。 您可用 ROWID、_ROWID_ 或OID 來存取這些欄位，但如果您在建立表格時使用了這些欄位名稱，那您以後就無法參照到SQLite 內部真正的 ROWID 。,Summary: in this tutorial, you will learn about SQLite AUTOINCREMENT attribute and when to use it in your in your table. Introduction to SQLite ROWID table. Whenever you create a table without specifying the WITHOUT ROWID option, you get an implicit auto
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 sqlite row_id 相關參考資料
SQLite Autoincrement
Summary. The AUTOINCREMENT keyword imposes extra CPU, memory, disk space, and disk I/O overhead and should be avoided if not strictly needed. It is usually not needed. In SQLite, a column with type IN... https://sqlite.org sqlite get ROWID - Stack Overflow
SELECT rowid, * FROM tbl1 WHERE letter = 'B' ... https://stackoverflow.com sqlite3 - sqlite rowid after deleting rows - Stack Overflow
I assume you already know a little about rowid , since you're asking about its interaction with the VACUUM command, but this may be useful information for future readers: rowid is a special colum... https://stackoverflow.com sql - Why can't you use SQLite ROWID as a Primary key? - Stack ...
From SQLite.org: If a table contains a column of type INTEGER PRIMARY KEY, then that column becomes an alias for the ROWID. You can then access the ROWID using any of four different names, the origin... https://stackoverflow.com android - Get last updated row id - Stack Overflow
The insert function returns the rowid because there is no other way of determining what value was automatically generated by the database. Updates do not have this problem; the value of the whereClau... https://stackoverflow.com android - Clarification on the row_id returned by sqlite's insert ...
The row_id returned by insert() is the unique identifier for the row inserted, and it's an identifier used internally by SQLite. On the other hand, you can have a column in the table that represe... https://stackoverflow.com python 2.7 - SQLite starting rowid of 0 - Stack Overflow
The documentation says that, with AUTOINCREMENT,. the ROWID chosen for the new row is at least one larger than the largest ROWID that has ever before existed in that same table. So the algorithm look... https://stackoverflow.com Rowid Tables - SQLite
The PRIMARY KEY of a rowid table (if there is one) is usually not the true primary key for the table, in the sense that it is not the unique key used by the underlying B-tree storage engine. The excep... https://www.sqlite.org 網路技術趨勢觀測站: SQLite 學習筆記之一- 基本用法
SQLite 中的每張表格裡的每一列都會有一個「ROWID」欄位，該欄位的值是64 位元的有號整數（singed integer）。在同一張表格裡的每列ROWID 值都是唯一的。 您可用 ROWID、_ROWID_ 或OID 來存取這些欄位，但如果您在建立表格時使用了這些欄位名稱，那您以後就無法參照到SQLite 內部真正的 ROWID 。 http://garyliutw.blogspot.com SQLite AUTOINCREMENT : Why You Should Avoid Using It
Summary: in this tutorial, you will learn about SQLite AUTOINCREMENT attribute and when to use it in your in your table. Introduction to SQLite ROWID table. Whenever you create a table without specify... http://www.sqlitetutorial.net |