What is the string concatenation operator in Oracle?

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What is the string concatenation operator in Oracle SQL?

Are there any "interesting" features I should be careful of?

(This seems obvious, but I couldn't find a previous question asking it).

It is ||, for example:

select 'Mr ' || ename from emp;

The only "interesting" feature I can think of is that 'x' || null returns 'x', not null as you might perhaps expect.

Concatenation Operator, It is || , for example: select 'Mr ' || ename from emp;. The only "interesting" feature I can think of is that 'x' || null returns 'x' , not null as you might� What is the string concatenation operator in Oracle SQL? Are there any "interesting" features I should be careful of? (This seems obvious, but I couldn't find a previous question asking it). sql oracle plsql string-concatenation

There's also concat, but it doesn't get used much

select concat('a','b') from dual;

What is the string concatenation operator in Oracle?, This tutorial shows you how to use Oracle CONCAT() function to concatenate two strings into a single string. The concatenation operator || also is convered. Trailing blanks in character strings are preserved by concatenation, regardless of the data types of the string or CLOB . On most platforms, the concatenation operator is two solid vertical bars, as shown in Table 4-4. However, some IBM platforms use broken vertical bars for this operator.

I would suggest concat when dealing with 2 strings, and || when those strings are more than 2:

select concat(a,b)
  from dual

or

  select 'a'||'b'||'c'||'d'
        from dual

Oracle CONCAT, This Oracle tutorial explains how to use the Oracle / PLSQL || concatenate operator The Oracle / PLSQL || operator allows you to concatenate 2 or more strings� Syntax for the Oracle/PLSQL statement || string1_id || string2_id || string_n_id. Operator parameters and arguments. string1_id – is the first line to combine. string2_id – second line to merge. string_n_id – n – line to merge. The operator || returns a string value. The operator || can be used in the following versions of Oracle/PLSQL

DECLARE
     a      VARCHAR2(30);
     b      VARCHAR2(30);
     c      VARCHAR2(30);
 BEGIN
      a  := ' Abc '; 
      b  := ' def ';
      c  := a || b;
 DBMS_OUTPUT.PUT_LINE(c);  
   END;

output:: Abc def

Oracle / PLSQL: || Operator, The second string to concatenate. Note. See also the || operator. Returns. The CONCAT function returns a string value. You can convert Oracle || string concatenation operator to + operator or CONCAT function in SQL Server and SQL Azure: + Operator. If any value is NULL, the result is NULL, unless CONCAT_NULL_YIELDS_NULL is OFF. Explicit casting required.

Using CONCAT(CONCAT(,),) worked for me when concatenating more than two strings.

My problem required working with date strings (only) and creating YYYYMMDD from YYYY-MM-DD as follows (i.e. without converting to date format):

CONCAT(CONCAT(SUBSTR(DATECOL,1,4),SUBSTR(DATECOL,6,2)),SUBSTR(DATECOL,9,2)) AS YYYYMMDD

Oracle / PLSQL: CONCAT Function, This SQL tutorial focuses on the Oracle String Concatenation, and provides name of a single column, you can use the double pipe concatenation operator (||) . The syntax for the || operator in Oracle/PLSQL is: string1 || string2 [ || string_n ] Parameters or Arguments string1 The first string to concatenate. string2 The second string to concatenate. string_n Optional. The nth string to concatenate.

Oracle String Concatenation, operator concatenates one or more strings into a single string in Oracle. Quick Example: -- Concatenate strings 'New ' and 'York' SELECT 'New� 1) About Concatenation operator: Oracle Docs 2) Performing SQL Queries Online: Oracle Live SQL. Note: For performing SQL Queries online you must have account on Oracle, if you don’t have then you can make by opening above link.

|| String Concatenation Operator, or concatenation operator is use to link columns or character strings. Note: For performing SQL Queries online you must have account on Oracle, if you don't� A block group related declarations or statements. In declare part, we declare variables and between begin and end part, we perform the operations. Given two strings and the task is to concatenate them and store it in another string.

SQL, Approach is to use the concatenation operator i.e. || . Below is the required implementation:. The Oracle concatenation operator is more widely used because of that and you barely see the Concat function at all. The last example shows that you can add many operators you need into your code and the only restriction is that they can’t be in the beginning and the end of the string.

Comments
  • docs.oracle.com/cd/B19306_01/server.102/b14200/operators003.htm
  • I'd expect null from a logical operation... not sure I'd ever thought about a string operation.
  • Well of course Oracle treats null and '' as the same, and 'x' || '' = 'x' makes sense. But if you think of null as "undefined" or "unknown" then 'x' || null could be any string beginning with 'x' and so is itself "unknown"!
  • || in Oracle is not a logical operator, therefore, 'x'||null returns x.
  • @ipip: I am confused - if by "logical operator" you mean operators like AND, NOT etc. then of course || is not a logical operator. But what does that have to due with 'x'||null returning x? n+null returns null, so is + a logical operator?
  • Oracle's handling of null in concatenation is non-standard in that it is different to the SQL92 spec (and Postgres) - see postgresql.org/message-id/921.1144705646@sss.pgh.pa.us
  • this is way better than the || symbol. using || is just confusing as per other language's use of ||.
  • Agreed for clarity, but || has the advantage to allow more then 2 fields easily
  • CONCAT is also compatible with other DBMSes (at least MySQL and Postgres).
  • Odd that it didn't occur to the ANSI SQL committee that anyone might need to concatenate more than two things. (Same goes for the geniuses at Oracle who came up with nvl().)
  • CONCAT is also available in Microsoft SQL Server 2012 and onwards. CONCAT, though nonstandard, is definitely the way to go if you want your code to be portable. (|| is the actual ANSI standard operator, though you wouldn't know it by looking at the support for it!)
  • sorry I realise this was 2 years ago, but why would you prefer concat(a,b) over a||b?
  • || shorter, more flexible, and simple. Look at his select statement.