How to query oracle date type

There are the following methods for querying Oracle DATE types: Equivalent query. Range query, using the BETWEEN and AND operators. Greater than/less than query. Function query, use the EXTRACT function to get the date part. BETWEEN SYSDATE query. Advanced queries include date conversion, date addition and time zone conversion.

Oracle DATE type query method

Introduction:
Oracle DATE data types are used to store date and time information. When querying DATE type, you can use the following methods:

1. Equivalent query:
Use an equal sign (=) or an inequality sign () to compare dates. For example:

 <code class="sql">SELECT * FROM my_table WHERE date_field = '2023-03-08'; SELECT * FROM my_table WHERE date_field  '2023-04-10';</code>

2. Scope query:
Use the BETWEEN and AND operators to specify the date range. For example:

 <code class="sql">SELECT * FROM my_table WHERE date_field BETWEEN '2023-03-01' AND '2023-03-31';</code>

3. Greater than/less than query:
Use greater than (>) or less than (

 <code class="sql">SELECT * FROM my_table WHERE date_field > '2023-02-28'; SELECT * FROM my_table WHERE date_field </code>

4. Function query:
Use the EXTRACT function to get a specific part of the date (for example, year, month, day). For example:

 <code class="sql">SELECT EXTRACT(YEAR FROM date_field) FROM my_table; SELECT EXTRACT(MONTH FROM date_field) FROM my_table;</code>

5. BETWEEN SYSDATE query:
Use BETWEEN with the SYSDATE function to get records within a specific date range. For example:

 <code class="sql">SELECT * FROM my_table WHERE date_field BETWEEN SYSDATE - 1 AND SYSDATE 1;</code>

Advanced Query:

• Date conversion: You can use the TO_DATE function to convert a string to a DATE type.
• Date addition and subtraction: You can use the and - operator to add and subtract dates. For example, date_field 3 pushes the date backwards by 3 days.
• Time Zone Conversion: You can use the AT TIME ZONE clause to convert a date to a specific time zone. For example, date_field AT TIME ZONE 'Europe/Berlin' converts dates to Berlin time zone.

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