At 11:37 PM +0100 5/12/07, Paulo J. Matos wrote:
Moreover, active in table
product is a boolean but I'm using an int since I don't know if
there's a boolean type, is there?
SQLite has just these types: Int, Real, Text, Blob, Null.
SQLite does not have a boolean data type, though I think it really
should; the boolean type is fundamental to the relational model of
data. For example, what is the data type of the expression in a
WHERE clause if not a boolean?
sqlite> CREATE TABLE productinfo (productasin INTEGER PRIMARY KEY,
infoid INTEGER PRIMARY KEY);
SQL error: table "productinfo" has more than one primary key
Why is this? How can I solve the problem?
If what you intended here was to have a single primary key which
comprises both the asin and id columns (most likely), such that only
the combination of the 2 must be unique, then you have to specify it
using different syntax, such as this:
CREATE TABLE productinfo (
productasin INTEGER,
infoid INTEGER,
PRIMARY KEY (productasin, infoid)
)
If you intended that each column is individually unique (unlikely),
then each one is simply a "key", which in SQLite syntax involves
saying one or both are "UNIQUE" rather than "PRIMARY KEY". By
definition, there can only be one "primary".
-- Darren Duncan
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