ORA-18100: XUST0001 – Updating expression in a wrong position
Cause: An updating expression was used in a position other than one of the following:
– The topmost expression in the body of a query.
– The MODIFY clause of a TRANSFORM expression.
– The RETURN clause of a FLWOR expression.
– The RETURN clauses of a TYPESWITCH expression in which every RETURN clause contains an updating expression, an empty expression ( ), or a call to the fn:error function.
– The THEN and ELSE clauses of a conditional statement in which both the then and else clauses contain either an updating expression, an empty expression ( ), or a call to the fn:error function.
– An operand of a comma expression in which each operand is either an updating expression, an empty expression ( ), or a call to the fn:error function.
– The content of a parenthesized expression.
– The body of a function declaration in which the keyword UPDATING is specified.
Action: None
ORA-18100是Oracle Database中常见的一种报错，它表明在更新表达式时出现了错误位置。
ORA-18100的官方解释是：“由于不正确的表达式的位置，不能更新表达式。”
1.查看给出的ORA-18100错误信息，以确定出现问题的位置；
2.查看可能存在问题的表达式，以确定表达式的正确性；
3.确认更新语句中表达式所引用的值是有效的；
4.重新检查应用程序的更新语句，以确保其符合SQL语言的规范。