Oracle error: ora-01722 invalid number

Procedure or Oracle The database appears “ORA-01722 Invalid number ” error

reason ：

1、Oracle Database Field is Number type , If you operate the database SQL Carried by this field in the statement Data is not of numeric type ,Oracle The database will automatically convert the data carried in this field into Number type , But in the end, if the conversion is not successful, an error will be reported .

for example SQL The data carried by this field in the statement is “123”, that Oracle Can successfully convert , If the data carried in this field is “2019 year 6 month 10 Japan ”,Oracle switch views , Report invalid number error ！

2、SQL In the sentence When multiple tables are associated , The value of the association condition field Oracle It will be automatically converted to numeric type , If the conversion fails, an error is reported .

for example A Primary Key ID(Number type ) and B A field in the table A_ID（Varchar2 type ）, Association statement ：from A left join B on A.ID = B.A_ID,Oracle Will first A_ID convert to Number type , If you insert data or modify data, you will A_ID The value of becomes non numeric （ english 、 Chinese characters or special characters ）, Now Oracle Conversion will report an error .