Simplifying ANTI JOIN with jOOQ Syntax
ANTI JOIN is a very useful operator from relational algebra. Regrettably, only few dialects support it in terms of SQL syntax, as we’ve written earlier. In jOOQ, you can write it as follows: If your...
View ArticleWhy JOIN USING Can Lead to Errors in SQL
Some SQL operators are as esoteric as they’re powerful. One of the oldest operator that you’ve likely hardly ever used in real world applications is NATURAL JOIN which is the default in relational...
View ArticleManaging Sensitive Data in jOOQ 3.21+ Logs
One of jOOQ’s most popular feature is the out-of-the-box debug logging experience. jOOQ developers find this feature very useful when developing their applications. Assuming you run a jOOQ query and...
View ArticleConsider using JSON arrays instead of JSON objects for serialisation
When implementing the awesome MULTISET operator in jOOQ, its implementation mostly relied on SQL/JSON support of various RDBMS. In short, while standard SQL supports nested collections via ARRAY or...
View ArticleWhen SQL Meets Lambda Expressions
ARRAY types are a part of the ISO/IEC 9075 SQL standard. The standard specifies how to: But it is very unopinionated when it comes to function support. The ISO/IEC 9075-2:2023(E) 6.47 <array value...
View ArticleThink About SQL MERGE in Terms of a RIGHT JOIN
RIGHT JOIN is an esoteric feature in the SQL language, and hardly ever seen in the real world, because almost every RIGHT JOIN can just be expressed as an equivalent LEFT JOIN. The following two...
View ArticleResisting the Urge to Document Everything Everywhere
Every product manager knows this situation: This is such a common pattern, and while it’s perfectly understandable for such a user to request this, it is so terribly wrong to give in to this user’s...
View ArticlejOOQ 3.20 released with ClickHouse, Databricks, and much more DuckDB support,...
New dialects: jOOQ 3.20 ships with 2 new experimental dialects: ClickHouse is a fast-moving SQL dialect with a historic vendor-specific syntax that is gradually migrated to a more standards compliant...
View ArticleEmulating SQL FILTER with Oracle JSON Aggregate Functions
A cool standard SQL:2003 feature is the aggregate FILTER clause, which is supported natively by at least these RDBMS: The following aggregate function computes the number of rows per group which...
View ArticleGetting Top 1 Values Per Group in Oracle
I’ve blogged about generic ways of getting top 1 or top n per category queries before on this blog. An Oracle specific version in that post used the arcane KEEP syntax: This is a bit difficult to read...
View ArticleAn Efficient Way to Check for Existence of Multiple Values in SQL
In a previous blog post, we’ve advertised the use of SQL EXISTS rather than COUNT(*) to check for existence of a value in SQL. I.e. to check if in the Sakila database, actors called WAHLBERG have...
View ArticleA Hidden Benefit of Implicit Joins: Join Elimination
One of jOOQ’s key features so far has always been to render pretty much exactly the SQL that users expect, without any surprises – unless some emulation is required to make a query work, of course....
View ArticlejOOQ 3.19’s new Explicit and Implicit to-many path joins
jOOQ 3.19 finally delivers on a set of features that will greatly simplify your queries further, after jOOQ 3.11 introduced implicit to-one joins: What are these features? Many ORMs (e.g. JPA,...
View ArticleWorkaround for MySQL’s “can’t specify target table for update in FROM clause”...
In MySQL, you cannot do this: The UPDATE statement will raise an error as follows: SQL Error [1093] [HY000]: You can’t specify target table ‘t’ for update in FROM clause People have considered this to...
View ArticlejOOQ 3.19.0 Released with DuckDB, Trino, Oracle 23c support, join path...
New Dialects It’s been a few releases since we’ve added support for new dialects, but finally some very interesting RDBMS of increasing popularity have joined the jOOQ family including: These dialects...
View ArticleMaven Coordinates of the most popular JDBC Drivers
Do you need to add a JDBC driver to your application, and don’t know its Maven coordinates? This blog post lists the most popular drivers from the jOOQ integration tests. Look up the latest versions...
View ArticleTo DAO or not to DAO
jOOQ’s DAO API is one of jOOQ’s most controversial features. When it was first implemented, it was implemented merely: There’s a strong hint about the third bullet given how popular Spring Data’s...
View ArticleJDBC Connection URLs of the Most Popular RDBMS
Need to connect to your RDBMS with JDBC and don’t have the JDBC connection URL or driver name at hand? No problem, just look up your RDBMS below:
View ArticleHow to Generate Package Private Code with jOOQ’s Code Generator
Java’s package private visibility is an underrated feature. When you omit any visibility modifier in Java, then the default (for most objects) is package private, i.e. the object is visible only to...
View ArticleHow to Pass a Table Valued Parameter to a T-SQL Function with jOOQ
Microsoft T-SQL supports a language feature called table-valued parameter (TVP), which is a parameter of a table type that can be passed to a stored procedure or function. For example, you may write:...
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