10 things in MySQL (that won't work as expected).
(I just discovered cracked.com) #10. Searching for a NULL SELECT * FROM a WHERE a.column = NULL In SQL, a NULL is never equal to anything, even another NULL. This query won't return anything and in fact will be thrown out by the optimizer when building the plan. When searching for NULL values, use this instead: SELECT * FROM a WHERE a.column IS NULL #9. LEFT JOIN with additional conditions SELECT
10 Essential SQL Tips for Developers | Envato Tuts+
1. Use the Right Language Web developers often have a plethora of languages at their disposal. It is crucial for developers to use the proper language for the job. With the right language, it is important that code efficiency is considered. Let's review the following code. In the first example, the developer is selecting all columns and all rows from the customer table. In the second example, the
MySQL
HeatWave Use automated and integrated generative AI and machine learning (ML) in one cloud service for transactions and lakehouse scale analytics. Get faster insights from all your data with unmatched performance and deploy apps in your choice of cloud providers. Learn More » MySQL Enterprise Edition The most comprehensive set of advanced features, management tools and technical support to achieve
1
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
処理を実行中です
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
