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Modify TIMESTAMP MySQL for use as Primary Key


Modify TIMESTAMP MySQL for use as Primary Key

By : Yeazy
Date : November 22 2020, 10:33 AM
I hope this helps you . After a bit more searching, I found this question that was previously asked and answered.
rounding time to the nearest 15 minutes in php/mysql
code :
SELECT
    SEC_TO_TIME((TIME_TO_SEC(TIME_GMT) DIV 10) * 10) AS TIME_GMT_MODIFY 
FROM table;


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MySQL PRIMARY KEYs: UUID / GUID vs BIGINT (timestamp+random)

MySQL PRIMARY KEYs: UUID / GUID vs BIGINT (timestamp+random)


By : solve
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I have run into this very problem in my professional life. We used timestamp + random number and ran into serious issues when our applications scaled up (more clients, more servers, more requests). Granted, we (stupidly) used only 4 digits, and then change to 6, but you would be surprised how often that the errors still happen.
Over a long enough period of time, you are guaranteed to get duplicate key errors. Our application is mission critical, and therefore even the smallest chance it could fail to due inherently random behavior was unacceptable. We started using UUIDs to avoid this issue, and carefully managed their creation.
How do I reset primary key according to timestamp in MySQL table?

How do I reset primary key according to timestamp in MySQL table?


By : websanjal
Date : March 29 2020, 07:55 AM
With these it helps Create a new table called users2 that has the same structure as users:
code :
CREATE TABLE users2 LIKE users;
INSERT INTO users2
(col1, col2, ... coln)
SELECT col1, col2, ... coln
FROM users
ORDER BY your_timestamp
INSERT INTO tracks2
(`timestamp`,`from_user`,`source_filename`,`uploaded_page`,`operating_system`,`browser`,`os_browser_version`,`title`,`artist`,`album`,`genre`,`format`,`bitrate`,`conversion_needed`,`conversion_successful`,`art_extracted`,`art_location`,`file_location`,`status`)
SELECT `timestamp`,`from_user`,`source_filename`,`uploaded_page`,`operating_system`,`browser`,`os_browser_version`,`title`,`artist`,`album`,`genre`,`format`,`bitrate`,`conversion_needed`,`conversion_successful`,`art_extracted`,`art_location`,`file_location`,`status`
FROM tracks
ORDER BY timestamp
Cassandra clustering with timestamp doesn't work as expected if the primary key contains (timeuuid and timestamp)

Cassandra clustering with timestamp doesn't work as expected if the primary key contains (timeuuid and timestamp)


By : Kim Gerondio
Date : March 29 2020, 07:55 AM
With these it helps Yes, this is the way Cassandra is designed to work. Clustering order only works within a partition. That's because each partition key is hashed into a token to determine where it should be stored in the cluster (to provide optimal data distribution). The rows within each partition are then written on-disk in their clustering order.
So in your first example, each row is sorted by time within each id. Of course, as each partition key (id) is different, you have no way of seeing that. But in your second example, your partition keys are the same, so your results are clustered by time.
code :
aploetz@cqlsh:stackoverflow2> SELECT token(id),id,time FROM dummy3;

 token(id)            | id    | time
----------------------+-------+--------------------------
 -3758069500696749310 | hello | 1969-12-31 19:06:40-0600
 -3758069500696749310 | hello | 1969-12-31 18:50:00-0600
 -3758069500696749310 | hello | 1969-12-31 18:33:20-0600
 -3758069500696749310 | hello | 1969-12-31 18:16:40-0600

(4 rows)
aploetz@cqlsh:stackoverflow2> SELECT token(id),id,time FROM dummy2;

 token(id)            | id                                   | time
----------------------+--------------------------------------+--------------------------
 -5795426230130619993 | e1fa7a80-1e64-11e5-8bf5-55cdf06f740f | 1969-12-31 18:33:20-0600
 -2088884548269216731 | e3bbb280-1e64-11e5-8bf5-55cdf06f740f | 1969-12-31 18:50:00-0600
  8496311684589314797 | e5ceb400-1e64-11e5-8bf5-55cdf06f740f | 1969-12-31 19:06:40-0600
  8930307282139899213 | e0719090-1e64-11e5-8bf5-55cdf06f740f | 1969-12-31 18:16:40-0600

(4 rows)
Cannot modify a primary key in MySQL

Cannot modify a primary key in MySQL


By : karan wahie
Date : March 29 2020, 07:55 AM
Hope that helps 1 - Remove the constraint of the primary key 2 - Alter the primary key field length 3 - Create another constraint to the primary key
how to make mysql automatically update column to current timestamp on every modify row operation?

how to make mysql automatically update column to current timestamp on every modify row operation?


By : Kazzrie
Date : March 29 2020, 07:55 AM
this will help there are 2 columns in my mysql table: created_on and modified_on.I have set the default value for created_on column to CURRENT_TIMESTAMP. thus on every insert operation in the table the created_on column correctly sets the value to current timestamp.however i want that when i update the same row the 'modified_on' column updates the value to the timestamp when it is updated.Let me know if i use any function/trigger to do so or is there any in-build mysql feature for the same , Try alter your table with ON UPDATE keyword like:
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