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You should definitely use an index. MySQL has no clue what order those timestamps are in, and in order to find a record for a given timestamp (or timestamp range) it needs to look through every single record. And with 4 million of them, that's quite a bit of time!

The index date is the date that exposed participants enter the cohort study (the latest of their start of follow-up or date they become exposed). The idea is to match 1:3 the exposed participants to eligible controls, on exact sex, area and +/-3 on year of birth.

Yes, it is generally a good idea to have an index on a field used in a query criteria. This is really useful when there are a large number of documents (e.g., a million) in the collection. The index will be used to run the query fast.

The index date is defined as the first date of receiving a new LOT after completing a line of therapy with all three drug classes.

Index date is the earliest date of prescription of the index drug (AOM or OA) for the treatment of schizophrenia within the identification period.

The index type for timestamped data is DatetimeIndex. The index type for period data, which shows the fixed interval date data, is PeriodIndex The index type for the Timedelta data, which shows the time between two dates, is TimedeltaIndex.

The date of experiencing this outcome (e.g., the date of admission during which the diagnosis is received) is considered the index date. Cases should represent outcome events from the underlying cohort, that is, events that would be included as outcomes in the corresponding cohort study.

The Index Date is the last day of each annual period beginning on the Policy Date and the same day of each year thereafter. Example: If the Policy Date is January 1, 2003, the first Index Date is January 31, 2003 and the last day of each following month.

You should definitely use an index. MySQL has no clue what order those timestamps are in, and in order to find a record for a given timestamp (or timestamp range) it needs to look through every single record. And with 4 million of them, that's quite a bit of time!

The index date is the date that exposed participants enter the cohort study (the latest of their start of follow-up or date they become exposed). The idea is to match 1:3 the exposed participants to eligible controls, on exact sex, area and +/-3 on year of birth.

Yes, it is generally a good idea to have an index on a field used in a query criteria. This is really useful when there are a large number of documents (e.g., a million) in the collection. The index will be used to run the query fast.

The index date is defined as the first date of receiving a new LOT after completing a line of therapy with all three drug classes.

Index date is the earliest date of prescription of the index drug (AOM or OA) for the treatment of schizophrenia within the identification period.

The index type for timestamped data is DatetimeIndex. The index type for period data, which shows the fixed interval date data, is PeriodIndex The index type for the Timedelta data, which shows the time between two dates, is TimedeltaIndex.

The date of experiencing this outcome (e.g., the date of admission during which the diagnosis is received) is considered the index date. Cases should represent outcome events from the underlying cohort, that is, events that would be included as outcomes in the corresponding cohort study.

The Index Date is the last day of each annual period beginning on the Policy Date and the same day of each year thereafter. Example: If the Policy Date is January 1, 2003, the first Index Date is January 31, 2003 and the last day of each following month.