A lesser-known SQL feature is the DEFAULT keyword, which can be used in INSERT and UPDATE statements. Consider the following table, created using standard SQL syntax: CREATE TABLE timestamps ( id INTEGER GENERATED BY DEFAULT AS IDENTITY(START WITH 1), t TIMESTAMP DEFAULT CURRENT_TIMESTAMP, CONSTRAINT pk_values PRIMARY KEY (id) ) Now, in order to generate a … Continue reading Lesser-Known SQL Features: DEFAULT VALUES
Tag: insert
How to simulate MySQL’s INSERT statement extensions
I have previously posted about the SQL MERGE statement, and how powerful it is here: https://blog.jooq.org/arcane-magic-with-the-sql2003-merge-statement/ Unfortunately, not all databases support this statement. Also, very often it is quite a bit of overkill, when what you want to do is to simply INSERT or UPDATE a single record, depending on whether it already exists. MySQL's … Continue reading How to simulate MySQL’s INSERT statement extensions
Postgres INSERT .. RETURNING clause and how this can be simulated in other RDBMS
One of jOOQ's major features is to take the most useful SQL constructs and clauses from any RDBMS and make them available to other SQL dialects, as well. This had been done previously with MySQL's INSERT .. ON DUPLICATE KEY UPDATE construct, which can be easily simulated with the more powerful SQL standard MERGE statement, … Continue reading Postgres INSERT .. RETURNING clause and how this can be simulated in other RDBMS