How to enter date type in 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 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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