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However, this may not continue to be true in future releases, and Oracle recommends that you do not treat empty strings the same as nulls.
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Oracle Database currently treats a character value with a length of zero as null. I also learned that we should not write PL/SQL assuming empty strings will always evaluate as NULL: If I dont input any value and press the Enter / Return key, it will select the default. It didnt Then at sql prompt type / (it will run the previous SQl query in. Thus, NOT FALSE evaluates to TRUE, but NOT UNKNOWN evaluates to UNKNOWN.Ī reference table is provided by Oracle: Condition Value of A Evaluation I have an SQL script which when run prompts me to input a value. 0, i used a table input step to get the result and set it as a named variable. However, a condition evaluating to UNKNOWN differs from FALSE in that further operations on an UNKNOWN condition evaluation will evaluate to UNKNOWN. For example, a SELECT statement with a condition in the WHERE clause that evaluates to UNKNOWN returns no rows. The documentation further states:Ī condition that evaluates to UNKNOWN acts almost like FALSE. However, all other comparisons evaluate to UNKNOWN, not FALSE. Provide an alternate null value that does not exist in your data:ĭbms_output.put_line('The two strings are not equal') Īccording to the Oracle 12c documentation on NULLS, null comparisons using IS NULL or IS NOT NULL do evaluate to TRUE or FALSE. If you expect empty strings or NULLs, you'll need to handle those with NVL(): DECLARE Prompt executing intermediate serveroutput offĪs Phil noted, the empty string is treated as a NULL, and NULL is not equal or unequal to anything. In Command line, using SQLCMD utility or dosbatch file you can prompt for the input.
#Sql prompt for input code
If anybody does have the answer, plz email me at.6 answers Top answer: Here is a piece of code that does something similar to what you want I thnk.Dim WhereClause. Id like to be able to run a script in SQLPlus with an input parameter (i.e. Im very beginner in psql and i have a question.Here is the code:SET serveroutput ONACCEPT myVariable PROMPT Input value: BEGIN dbmsoutput.putline(My. While i = '||v_range_start||' and rn <= '||v_range_end||' I also have the same problem, but I usually dont have as much time to log on here. * You don't need to see the details of the query. But if you try to append your characters to the variable name, SQLPlus will simply interpret it as a new variable name.
#Sql prompt for input plus
Executing the intermediate script will execute multiple queries with different ranges imposed on rownum, and spool to a different file for each query. For example, you might want to set the SQL prompt to a combination of a variable plus some fixed characters like SQL>. The basic idea is that the master sqplplus script generates an intermediate script that will split the output to multiple files. Got a solution, don't know why I didn't think of this sooner.