What does SQL Select symbol || mean? What does SQL Select symbol || mean? mysql mysql

What does SQL Select symbol || mean?


mysql sql oracle ansi-sql

|| represents string concatenation. Unfortunately, string concatenation is not completely portable across all sql dialects:

  • ansi sql: || (infix operator)
  • mysql: concat ( vararg function ). caution: || means 'logical or' (It's configurable, however; thanks to @hvd for pointing that out)
  • oracle: || (infix operator), concat ( caution: function of arity 2 only ! )
  • postgres: || (infix operator)
  • sql server: + (infix operator), concat ( vararg function )
  • sqlite: || (infix operator)

hopefully the confusion is complete ...

mysql sql oracle ansi-sql

It is a concat statement. It will concatenate the two strings.

Here is a helpful post!

What is the difference between "||" operator and concat function in Oracle?

mysql sql oracle ansi-sql

It's a concatenation operator. So you would get 'a,b' from that.I think || will work on most RDBMS's. SQL Server requires the + operator (thanks to HVD for setting me straight!).

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