What does || mean in oracle?

The || operator in Oracle is used to concatenate strings. It concatenates two or more strings with the syntax string1 || string2 || ... || stringN. It has lower precedence, so operator order needs to be considered when using it.

|| Operator in Oracle

||## The # operator is used to concatenate strings in Oracle and is called the string concatenation operator.

Usage

Use the

|| operator to concatenate two or more strings. The syntax is as follows:

<code>string1 || string2 || ... || stringN</code>

Among them,

string1, string2, etc. represent the strings to be connected.

Example

<code>SELECT 'Hello' || ' ' || 'World' FROM dual;</code>

Result:

<code>Hello World</code>

Notes

Two or more Multiple empty strings concatenated together remain an empty string.
• If any of the concatenated strings is
• NULL, the result is NULL.
• || operators have lower precedence, so you need to pay attention to the order of operators when using them in expressions.

Alternative methods

In some cases, you can use other methods to concatenate strings, for example:

Use
• CONCAT() Function: CONCAT(string1, string2, ..., stringN)
Use
• DBMS_LOB.STRINGTOBLOB() Function: DBMS_LOB.STRINGTOBLOB(string1 || string2 || ... || stringN)

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