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This article explores common errors and solutions when executing DDL statements (particularly TRUNCATE TABLE) in Oracle PL/SQL stored procedures. Through analysis of a typical error case, it explains why direct use of TRUNCATE TABLE fails and details the proper usage, working principles, and best practices of the EXECUTE IMMEDIATE statement. The article also discusses the importance of dynamic SQL in PL/SQL, providing complete code examples and performance optimization tips to help developers avoid pitfalls and write more robust stored procedures.

This article comprehensively explores two primary methods for executing multiple SQL statements in Java applications using JDBC: configuring the database connection property allowMultiQueries=true and utilizing stored procedures. The analysis covers implementation principles, code examples, and applicable scenarios for each approach, along with complete error handling and result processing mechanisms. Considering MySQL database characteristics, the paper compares performance differences and security considerations of various methods, providing practical technical guidance for developers handling complex SQL operations in real-world projects.

This article provides an in-depth examination of the common ORA-00904 error in Oracle databases, focusing on the critical role of double quotes in identifier definitions. Through concrete SQL query examples, it explains the rule that mixed-case identifiers must be enclosed in double quotes and offers practical recommendations for avoiding such errors. The article combines DDL script examples and query comparisons to deeply analyze Oracle's identifier resolution mechanism, providing database developers with comprehensive problem diagnosis and prevention strategies.