在Java中，在ResultSet元数据请求中使用的“％”参数是什么？

Question

In this example

ResultSet rsTables = metadata.getTables(null, "%", "%", tableTypes);

I understand the % stands for a wildcard but cannot find any documentation on this. I have found documentation for * and ? as wildcards, but my only experience with the % is as a modulus in arithmetic operations.

Answer 1

The parameters for those functions are (ultimately) used as part of an expression that uses LIKE in a SQL statement that retrieves the requested information.

The % reflects this, as it is the wildcard for multiple characters in SQL

See eg the Postgres manual for an example