OR ） CASE WHEN sex = ‘1’ THEN ‘男’ WHEN sex = ‘2’ THEN ‘女’ ELSE ‘其他’ END
CASE WHEN allows you to assign the genres yourself. Looking at the first few songs, you can see they all have the same GenreId and we know that 1 corresponded to the “Rock” genre. We can use CASE WHEN to check if there is a 1 in the GenreId Column and then put “Rock” into ...
case when OTPTradeId is NULL Then 'No' Else 'Yes' End as 'TCM' from Trade left join TCM on TradeID = OTPTradeId where tradedate = '17 Jun 2013' Viewing 5 posts - 1 through 4 (of 4 total) You must be logged in to reply to this topic.Login to reply...
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You can also use MySQLREGEXPresults in anUPDATEstatement to edit records. For instance, in this case, you can now update the customer'szipcode column to the correct value using the statement below. mysql> UPDATE customers SET zip = '8659' WHERE address REGEXP '8659$'; ...
Create a SQL View To create a new view object, you use the CREATE VIEW statement followed by the desired name of the object and the SELECT statement used for abstraction. Here, you create a new view object.mysql> CREATE VIEW population_stats AS SELECT name, population FROM states LEFT ...
written in PSEUDOSQL just to show the idea. In real life, you can create your table or use ...
Dive deep into Common Table Expressions (CTEs) and their power. Simplify complex queries and boost your SQL efficiency. Start mastering CTEs today!
MySQL’s performance, ease of use, and low cost combined with its ability to reliably scale as a business grows have made it the world’s most popular open source database. MySQL: Distinguishing It from SQL The acronym “SQL” stands for Structured Query Language, a type of programming lang...
The initial data must be present on each node before the topology is configured. Use SQL Server backup and restore functionality to initialize data for the publication at each node in the topology. The backup should come from the first node that is configured; in this case, that isServer A...