2025-07-12
Outer Joining With ANSI SQL-89 and SQL-92
2025-07-12
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Outer Joining With ANSI SQL-89 and SQL-92

Introduction I recently implemented a quick fix for the rule G-3130 to transform queries to ANSI SQL-92 syntax. One of the challenges was to handle Oracle’s outer-join syntax (+). In ANSI SQL-89, join and filter criteria are part of the WHERE clause. It’s not easy to distinguish them. In this blog post, […]
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2025-03-18
dbLinter logo
2025-03-18
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dbLinter Rules Repository

Introduction Today I proudly announce that the Joint Venture between United Codes and Grisselbav released the initial version of the dbLinter Rules Repository website. This is the first publicly available component of the dbLinter tool suite. What is dbLinter? dbLinter is a suite for checking and improving the quality of database applications. […]
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2024-07-29
IslandSQL Final Episode 10: Parsing PL/pgSQL
2024-07-29
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IslandSQL Final Episode 10: Parsing PL/pgSQL

Introduction IslandSQL is a parser for SQL files targeting OracleDB or PostgreSQL. The parser is available on Maven Central and can process SQL*Plus, SQLcl or psql statements besides SQL statements. However, the focus is on statements with static DML statements and code in PL/SQL and PL/pgSQL. For static code analysis, for example. […]
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2024-06-27
IslandSQL Episode 9: GraphQL, JSON and Flexible Schemas With Duality Views
2024-06-27
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IslandSQL Episode 9: GraphQL, JSON and Flexible Schemas With Duality Views

Introduction In the last episode, we looked at some new features in Oracle Database 23.4. The IslandSQL grammar now covers all statements that can contain static DML statements and code in PL/SQL and PL/pgSQL. While implementing the ANTLR grammar for the create JSON relational duality view statement I stumbled over GraphQL in […]
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2024-06-15
IslandSQL Episode 8: What's New in Oracle Database 23.4?
2024-06-15
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IslandSQL Episode 8: What’s New in Oracle Database 23.4?

Introduction In the last episode, we looked at some features in PostgreSQL which I miss in the Oracle Database. The IslandSQL grammar now covers PL/SQL and the related DDL statements. The implementation was more complex than expected, mainly because of the incompatibilities between PostgreSQL and the Oracle Database. I will probably deal […]
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2024-03-23
IslandSQL Episode 7: DML Statements in PostgreSQL 16 and What I Miss in Oracle Database 23c
2024-03-23
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IslandSQL Episode 7: DML Statements in PostgreSQL 16 and What I Miss in Oracle Database 23c

Introduction In the last episode, we covered DML statements in SQL*Plus/SQLcl scripts for the Oracle Database 23c. The IslandSQL grammar can now also handle PostgreSQL 16 DML statements in psql scripts. In this blog post, we will look at some features in PostgreSQL 16 which I miss in the Oracle Database 23c. […]
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2024-01-30
IslandSQL Episode 6 - DML Statements in Oracle Database 23c
2024-01-30
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IslandSQL Episode 6: DML Statements in Oracle Database 23c

Introduction The IslandSQL grammar now covers all DML statements. This means call, delete, explain plan, insert, lock table, merge, select and update. In this episode, we will focus on new features in the Oracle Database 23c that can be used in insert, update, delete and merge statements. For the select statement see […]
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2024-01-12
IslandSQL Episode 5 - Select in Oracle Database 23c
2024-01-12
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IslandSQL Episode 5: Select in Oracle Database 23c

Introduction In the last episode, we extended the expressions in the IslandSQL grammar to complete the lock table statement. The grammar now fully covers expressions, conditions and the select statement. In this episode, we will focus on optimizer hints and new features in the Oracle Database 23c that can be used in the […]
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2023-03-05
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2023-03-05
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IslandSQL Episode 4: Expressions

Introduction In the last episode, we extended the IslandSQL grammar covering the complete lock table statement. However, the support for expressions was very limited. It was not possible to use a date literal or to_date function to determine a partition to be locked. Time to fix that. In this episode, we will have […]
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2023-02-19
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2023-02-19
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IslandSQL Episode 3: Lock Table

Introduction In the last episode, we extended the IslandSQL grammar to cover all DML statements as a single lexer token. Now it’s time to handle the complete grammar for one DML statement. The simplest one is lock table. A good reason to start with it and lay the foundation for the other DML […]
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