Articles to Write
6. Exception Handling 7. Procedures and Functions 8. Packages 9. Triggers 10. PL/SQL Collections 11. Dynamic SQL 12. Transactions in PL/SQL 13. Bulk Processing in PL/SQL 14. Working with XML…
Oracle SQL Error Cheat Sheet: Common Errors and Fixes
Oracle SQL is powerful but can be tricky. Even experienced users frequently encounter errors due to syntax issues, data type mismatches, or database constraints. This cheat sheet explains the most…
Solving ORA-00936: Missing expression
ORA-00936: Missing expression is a common Oracle Database error. It means Oracle expected a valid part of an SQL statement (an “expression”) but didn’t find one. In plain terms: your…
Solving ORA-00932: Inconsistent datatypes: expected “type1” but got “type2”
This is an Oracle Database error that happens when Oracle expects one type of data (like a number, date, or string) but finds a different, incompatible type during SQL execution.…
Solving ORA-00907: Missing right parenthesis
ORA-00907: Missing right parenthesis is a common Oracle Database error. It means Oracle expected a closing parenthesis ) in your SQL statement but didn’t find it where it was required.…
Understanding Oracle Cursors in PL/SQL
In Oracle PL/SQL, cursors are pointers that allow you to work with the result set of a SQL query. They act as handles for fetching rows returned by a SELECT…
Oracle PL/SQL Control Structures: A Comprehensive Guide
Control structures in Oracle PL/SQL let you control the flow of your program: making decisions, looping through data, and exiting loops. These are essential for writing flexible, efficient, and readable…
Solving ORA-00904: Invalid identifier Oracle Database Error
ORA-00904: Invalid identifier is a common Oracle Database error. It means Oracle doesn’t recognize a column name, alias, or identifier you’re using in your SQL statement. Put simply: you’ve referenced…
Solving PLS-00553: Character Set Mismatch Between Variable and Database Column
The PLS-00553 error in PL/SQL indicates a character set incompatibility between a variable (typically a VARCHAR2, CHAR, or CLOB) and a column or function result with a different character set.…
Solving PLS-00487: Invalid Reference to Variable in PL/SQL
The PL/SQL error PLS-00487: Invalid reference to variable <name> occurs when you attempt to reference a variable in a context where it is not allowed, such as: This article explores…