Database Link

What DB Link Can and Cannot Do

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Can and Cannot For better understanding the features of a database link which may play an important role in data migration, we should study what a database link can and cannot do in a distributed database system in order to develop our data migration strategy. Generally speaking, you can perform Data Query Language (DQL) and […]
SQL

How to Resolve ORA-00903: invalid table name

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In this post, I will introduce 3 main error patterns about ORA-00903, they are: Violating Naming Rules Missing Quotes Incorrect Syntax ORA-00903 due to Violating Naming Rules Without complying with database object naming rules, we can’t create a table with unusual strings in normal way. Let’s see some cases that throw ORA-00903. First of all, […]
SQL

4 Types of SQL in Relational Database

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Types of SQL Statements SQL statements in relational database management system (RDBMS) could sometimes be too complicated to be analyzed for. As SQL developers, we should at least be able to distinguish what types of the statements that are using. According to conventional SQL classification, there are 4 basic types of SQL statements. Data Query […]