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Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

Do you want to find out how to avoid duplicates in the results of a SQL SELECT query? This article will show you how. Simply use the DISTINCT clause and between the SELECT clause and the fields.

Everyone likes doing things with SQL, so let's make it so people can do batch ingestion using SQL INSERT! I'd like to make it possible to write an INSERT INTO .... SELECT query that maps onto Druid's ...

关于SQL修改数据，我们前两期聊了删和改；还剩下的【增】，也就是INSERT语句；今个就来说它。 1. 在SQL中，可以使用INSERT ...

Credit card information in your business's database is much more secure if you encrypt it. If you store this information as plain text, unscrupulous users can easily steal the data either through ...