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

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

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

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

Example

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

<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

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

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