I will summarize my thoughts after reading "Understanding SQL Reasonably Well with Illustrations."Those with existing SQL ...

Learn how PostgreSQL window functions can compare rows and organize data using LAG, LEAD, and NTILE. LAG returns a value from ...

PostgreSQL window functions make it possible to rank records, calculate running totals, and analyze data without combining ...

The next improvement that couldn't be solved within Excel aloneSeries: "The Journey of Field DX" Part 2Last time, I wrote ...

本内容遵循CC 4.0 BY-SA版权协议 SQL里最常被低估的，其实是字段级的字符串操作能力。很多人一看到“从指定字段查找指定字符”，第一反应是 LIKE 加 % 模糊匹配——这就像用消防水枪给盆栽浇水 ...

It’s the American way to assume that all life’s problems can be solved by making the right purchase, especially when it comes to getting a good night's sleep. Blackout curtains, an organic mattress ...

PARTITION BY divides the query result set into partitions. ORDER BY defines the logical order of the rows within each partition of the result set. If you don't specify PARTITION BY, the function ...

Blocking is normal in any lock-based relational database, but persistent or long-running blocking degrades throughput and causes application timeouts. This article describes what blocking is in SQL ...

Hello football friends, and welcome to the Thursday edition of the Pick Six newsletter! This is your final newsletter of the week, so I'm going to remind you now to please hug your family this weekend ...

The 2026 NFL training camps are on the horizon, and with that in mind, ESPN surveyed league executives, coaches and scouts to help us rank the top 10 players at 11 different positions. This is the ...

WHEN IT COMES to sex positions, there’s one that consistently bow-wows in the bedroom: Doggy style. In fact, roughly 30 percent of people said it was their favorite position in a February 2026 survey ...

原创 最新推荐文章于 2026-05-27 22:15:49 发布 · 33 阅读 POSITION函数返回子串首次出现位置（从1开始），未找到返回0；标准写法为POSITION('sub' IN str)，PostgreSQL/MySQL 8.0+支持，旧版MySQL需用LOCATE；大小写 ...