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Results tagged with auto-increment
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user 2703
Numerical sequence generation for automatic key creation
0
votes
MySQL suddenly producing out of sequence autoinc numbers
InnoDB does not generate auto-inc values less than the highest value in the table. Even if you use ALTER TABLE to set the auto-increment to a lower value, it immediately resets to the max+1 value.
But …
- 16k
1
vote
Preserve Autoincrement ID
You can advance the "highest" value for the table like this:
ALTER TABLE user AUTO_INCREMENT=5000;
After you do that, the id value generated for the next insert will be 5001 or greater. The auto-incr …
- 16k
21
votes
Accepted
How are auto_increment keys handled in INSERT (SELECT * FROM...)
You can insert into an auto-increment column and specify a value. This is fine; it simply overrides the auto-increment generator.
If you try to insert a value of NULL or 0 or DEFAULT, or if you omit …
- 16k
3
votes
Accepted
Export and import a table without a specific column
Another solution is to use LOAD DATA [LOCAL] INFILE, but override the columns list so the auto-increment value is inserted into a dummy variable:
Here's a demo:
I have a text file I call c.csv:
1 …
- 16k
1
vote
Is a unique index required for a sequential (autoincrementing) id?
Short answer: in InnoDB, the auto-increment column must be the leftmost column of some index, either the primary key (clustered) index, or else some secondary index. It doesn't have to be a unique key …
- 16k