Note that the integer key is one greater than the largest key that was in the table just prior to the insert.The new key will be unique over all keys currently in the table, but it might overlap with keys that have been previously deleted from the table.To create keys that are unique over the lifetime of the table, add the AUTOINCREMENT keyword to the INTEGER PRIMARY KEY declaration. Data of any type can (usually) be inserted into any column.
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If the largest possible key has previously existed in that table, then the INSERT will fail with an SQLITE_FULL error code. The datatype you assign to a column in the CREATE TABLE command does not restrict what data can be put into that column.
Every column is able to hold an arbitrary length string.
(There is one exception: Columns of type INTEGER PRIMARY KEY may only hold a 64-bit signed integer. This problem occurs when your primary key is a numeric type.
An error will result if you try to put anything other than an integer into an INTEGER PRIMARY KEY column.) But SQLite does use the declared type of a column as a hint that you prefer values in that format. Change the datatype of your primary key to TEXT and it should work. For a column with a numeric type, SQLite thinks that '0' and '0.0' are the same value because they compare equal to one another numerically.
So, for example, if a column is of type INTEGER and you try to insert a string into that column, SQLite will attempt to convert the string into an integer. (See the previous question.) Hence the values are not unique.
Multiple processes can have the same database open at the same time.Multiple processes can be doing a SELECT at the same time.Short answer: A column declared INTEGER PRIMARY KEY will autoincrement.Longer answer: If you declare a column of a table to be INTEGER PRIMARY KEY, then whenever you insert a NULL into that column of the table, the NULL is automatically converted into an integer which is one greater than the largest value of that column over all other rows in the table, or 1 if the table is empty.Or, if the largest existing integer key 9223372036854775807 is in use then an unused key value is chosen at random.For example, suppose you have a table like this: There is a function named sqlite3_last_insert_rowid() which will return the integer key for the most recent insert operation.