The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSE clause. ...
If I had named the column TotalOrders instead of Total Orders, I could have just put TotalOrders for the column name in the query instead of [Total Orders]. The ORDER BY statement defines how the result should be sorted. Here we sort by the Name column, which is a text column and ...
SQLQuick Referencefrom W3Schools ❮ PreviousNext ❯ SQL StatementSyntax AND / ORSELECT column_name(s) FROM table_name WHERE condition AND|OR condition ALTER TABLEALTER TABLE table_name ADD column_name datatype or ALTER TABLE table_name ...
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问SQL条件: if else语句EN我想得到国名以Fr开头的客户列表，如果在Fr%中没有客户，那么我想从Ger开始...
mysql SQL条件：if else语句注意：您将此问题标记为mySQL，但Northwinds数据库不是mySQL。例如，w3school...
W3Schools SQL Tutorial: If you would like to explore a detailed tutorial of SQL, this is the perfect place to start. This tutorial includes interactive examples you can edit, test, and recreate. Use it as a reference or complete the whole tutorial to practice using SQL. Click the greenStar...
SQL Quick Reference From W3Schools« Previous Next Chapter » SQL StatementSyntax AND / OR SELECT column_name(s) FROM table_name WHERE condition AND|OR condition ALTER TABLE ALTER TABLE table_name ADD column_name datatype or ALTER TABLE table_name DROP COLUMN column_name AS (alias) ...
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otherwisereturntheexpression:SELECTIFNULL(NULL,"W3Schools.com");