Firstly, the Index i_udatetime is Superfluous, you can remove it for
some efficiency points. (The Unique constraint already offers an Index
with udatetime as the left-most or main Index).
All I can still suggest or ask is: Are you sure there are no duplicates?
The correct SQL to check would be:
SELECT A.*
FROM EventLog AS A
JOIN EventLog AS B ON B.udatetime=A.udatetime AND B.device=A.device
AND B.code=A.code AND B.type=A.type
WHERE B.row_id <> A.row_id
Any row that shows up is a duplicate that would violate that Unique Index.
Further to this, I'm not sure if you omitted the other fields for
brevity or to explain the problem, but that INSERT query should never
work since you specify all those columns as NOT NULL, then you do not
give it DEFAULT values, and then you omit them from the INSERT, which
means it must fail on the NOT NULL constraint.
If this is not the case, and the above query doesn't show up any rows,
and the constraint still fails - mind letting us have a copy of the DB
file that produces that violation?
Cheers,
Ryan
On 2016/06/28 9:37 PM, Joe Pasquariello wrote:
Hello,
I'm a novice user of Sqlite, and could use some help. The code below
is intended to update a simple table to a new format. The changes
include reordering columns, dropping one column, and adding a new
"status" column (which is always 0). A constraint violation is being
reported on UNIQUE constraint for the new table. I assume this means
there is a row in the existing table that violates the constraint
imposed on the new table, but I've queried the existing table for rows
that would violate the constraint, and I don't find any. Is there
something else that could cause the violation?
Thanks,
Joe
BEGIN TRANSACTION;
DROP TABLE IF EXISTS TempEventLog;
ALTER TABLE EventLog RENAME TO TempEventLog;
CREATE TABLE IF NOT EXISTS EventLog(
rowid INTEGER PRIMARY KEY,
udatetime INTEGER NOT NULL,
device CHAR(16) NOT NULL COLLATE NOCASE,
localtime CHAR(32) NOT NULL COLLATE NOCASE,
code INTEGER NOT NULL,
type CHAR(16) NOT NULL COLLATE NOCASE,
text CHAR(64) NOT NULL COLLATE NOCASE,
status INTEGER NOT NULL,
UNIQUE(udatetime,device,code,type,status)
);
CREATE INDEX IF NOT EXISTS i_udatetime ON EventLog(udatetime);
CREATE INDEX IF NOT EXISTS i_code ON EventLog(code);
CREATE INDEX IF NOT EXISTS i_device_code ON EventLog(device,code);
INSERT OR ROLLBACK INTO EventLog (
udatetime, device, localtime, code, type, text, status )
SELECT udatetime, device, localtime, code, type, text, 0
FROM TempEventLog ORDER BY rowid;
DROP TABLE TempEventLog;
PRAGMA user_version = 1;
COMMIT;
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