如何使用 WHERE 子句过滤日期和时间范围？

Question

I'm trying to find customer engagements that occurred at specific date and times,

I think I have the date part correct however I can't seem to set the time right.

SELECT EngagementNumber,
       StartDate,
       StartTime
FROM Engagements
WHERE StartDate LIKE '2012-10-%%'
      AND StartTime BETWEEN '12:00:00.0000000' AND '17:00:00.0000000';

Answer 1

One reason you have downvotes is because you have chosen to tag your question with 2 databases, but the syntax for each is very different.

Another is that without some "key facts" we are just left guessing. eg what is the datatype of StartTime ?? this is vital to the solution because if data type is DATE then this would fail WHERE StartDate LIKE '2012-10-%%' but if the data type is VARCHAR or similar then it would work (sort of). We also need to know the data type of StartTime.

So: IF

1. you are using MySQL
2. The data type of StartDate is Date
3. The data type of StartTime is Time

Below is an example of how your query might work , see a demo at SQL Fiddle

Sample Data (MySQL) :

CREATE TABLE Engagements
    (`EngagementNumber` int, `StartDate` datetime, `StartTime` time)
;

INSERT INTO Engagements
    (`EngagementNumber`, `StartDate`, `StartTime`)
VALUES
    (1, '2017-09-01 00:00:00', '13:14:15'),
    (2, '2017-10-01 00:00:00', '14:15:16'),
    (3, '2017-10-11 00:00:00', '15:16:17')
;

Query 1 :

SELECT EngagementNumber,
       StartDate,
       StartTime
FROM Engagements
WHERE StartDate >= '2017-10-01' and StartDate < '2017-11-01'
AND StartTime BETWEEN '12:00' AND '17:00'

Results :

| EngagementNumber |            StartDate | StartTime |
|------------------|----------------------|-----------|
|                2 | 2017-10-01T00:00:00Z |  14:15:16 |
|                3 | 2017-10-11T00:00:00Z |  15:16:17 |

Please note that the same query would also work in SQL Server is the data types are the same as assumed here.

A final note. If the data types ARE date & time then they are NOT STRINGS (text) even if they might look like they are. So LIKE '2012-10%' will not work but storing date/time information as stings is NOT a good idea anyway.