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How to enter date type in oracle

May 03, 2024 am 12:03 AM
oracle

There are three ways to enter the DATE type in Oracle: direct input, using the TO_DATE function and using the CAST function. Direct input must follow the YYYY-MM-DD HH24:MI:SS format; the TO_DATE function syntax is TO_DATE(string, formatted string); the CAST function syntax is CAST(string AS DATE).

How to enter date type in oracle

How to enter the DATE type in Oracle

Input directly

The most direct way is to use the following syntax:

<code>DATE '格式化日期和时间'</code>

The date and time must be formatted according to a specific format, as follows:

<code>YYYY-MM-DD HH24:MI:SS</code>

For example:

<code>DATE '2023-03-08 14:30:00'</code>

Use the TO_DATE function

TO_DATE function converts the string to the DATE type. The syntax is as follows:

<code>TO_DATE(字符串, 格式化字符串)</code>

For example:

<code>TO_DATE('08-03-2023', 'DD-MM-YYYY')</code>

Use the CAST function

The CAST function can also convert a string to a DATE type. The syntax is as follows:

<code>CAST(字符串 AS DATE)</code>

For example:

<code>CAST('2023-03-08 14:30:00' AS DATE)</code>

Other notes

  • The Oracle DATE type does not contain time zone information.
  • If no time is specified, it defaults to 00:00:00.
  • If the date and time are invalid, an exception will be thrown.
  • The TO_DATE and CAST functions return NULL values ​​if the string format is incorrect.

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