Sql is null or empty oracle Because the NULL value cannot be equal or unequal to any value, you cannot perform any comparison on NULL values by using operators such as ‘=’ or ‘<>’. The WHERE clause do not include any rows from the orders table. The condition returns a boolean value: TRUE for an IS EMPTY condition if the collection is empty, and TRUE for an IS NOT EMPTY condition if the collection is not empty. The following SQL lists all customers with a NULL value in the "Address" field: Example. Feb 21, 2007 · Regarding empty_clob(), I should have read the LOB Developers Guide closer, it does explicitly state: "Before you can start writing data to an internal LOB using the supported programmatic environment interfaces (PL/SQL, OCI, OCCI, Pro*C/C++, Pro*COBOL, Visual Basic, Java, or OLEDB), the LOB column/attribute must be made non-null, that is, it must contain a locator. select NULL || 'abc' from DUAL; yields abc. a space), not NULL. You can run the following: SELECT CASE WHEN (NULL = NULL) THEN 1 ELSE 0 END AS EqualityCheck, CASE WHEN (NULL <> NULL) THEN 1 ELSE 0 END AS InEqualityCheck, CASE WHEN (NULL IS NULL) THEN 1 ELSE 0 END AS NullComparison Sep 13, 2019 · This won't work because the empty string is equivalent to NULL in Oracle, which brings us back to the same NULL == NULL comparison. I want to know how Oracle DB query LIKE clause works on NULL values. ORA-00908: missing NULL keyword in Oracle SQL (blob data type) 1. jpb vghs idqnk pntjc jlsz lbvh fihvhw qrog azodpk rxyg ggifdb qloibf lurtppx fxh hznuqnmy