MySQL timestamp index
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「MySQL timestamp index」文章包含有：「10.3.14IndexedLookupsfromTIMESTAMPColumns」、「Creatinganindexonatimestamptooptimizequery」、「Indexingondatetimestamp」、「mysql」、「mysql」、「MySQLindexondatetimecolumn」、「TimestampfiltersonindexesfieldsinMySQL」、「UnderstandingIndexcreationinMySQL」、「UnixtimestampField&Indexes」
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10.3.14 Indexed Lookups from TIMESTAMP Columns
https://dev.mysql.com
The optimizer performs an index scan, first converting the search value from the session time zone to UTC, then comparing the result to the UTC index entries.
Creating an index on a timestamp to optimize query
https://stackoverflow.com
Indexes in general are a good idea for regularly queried fields. The only downside to defining indexes is that they use extra storage space.
Indexing on date timestamp
https://www.reddit.com
I have a MySQL query which rely on created_at column in php. Like this select * from xyz where created_at <= $inputMonth->endOfMonth().
mysql
https://dba.stackexchange.com
This new version of your query modifies NOW() by 20 hours, and so can use an index to find exactly where the records start that have that timestamp.
mysql
https://dba.stackexchange.com
created_at is timestamp with index. But when I use EXPLAIN, the column filtered shows 10, which is bad. What could be the cause of this 10 ?
MySQL index on datetime column
https://www.reddit.com
Indexing a datetime column in a large, frequently updated table can be a challenging decision. While indexing can improve query performance, it ...
Timestamp filters on indexes fields in MySQL
https://discourse.metabase.com
Hello. I have a “order” table with “Time” field, containing a unix timestamp (seconds resolution) of each order. This field is indexed.
Understanding Index creation in MySQL
https://stackoverflow.com
When you create an index on a TIMESTAMP field or any other data type, MySQL doesn't store a hash of the value or the literal value itself as the index key.
Unix timestamp Field & Indexes
https://forums.percona.com
When I index on the timestamp field, l_date_time(int(16)), the cardinality is the maximum (because there are no 2 times the same).