艾斯波如何連接表

Question

我敢肯定，這種說法作品在艾斯波：

/* query from table TableA when receive event PriceEvent */ 
ON PriceEvent p 
SELECT a.SymbolA, p.price 
FROM TableA a 
WHERE a.Symbol = p.Symbol 

但這一說法引發錯誤：

/* join table TableA with TableB */ 
ON PriceEvent p 
SELECT a.SymbolA, p.price, b.SymbolB 
FROM TableA a, TableB b 
WHERE a.Key = b.Key and a.Symbol = p.Symbol 

錯誤消息：

com.espertech.esper.client.EPStatementSyntaxException: Incorrect syntax near ',' expecting end-of-input but found a comma ',' 

然後我使用JOIN但它仍然不起作用：

/* join table TableA with TableB */ 
ON PriceEvent p 
SELECT a.SymbolA, p.price, b.SymbolB 
FROM TableA a inner join TableB b 
ON a.Key = b.Key 
WHERE a.Symbol = p.Symbol 

錯誤消息：

Incorrect syntax near 'join' (a reserved keyword) expecting end-of-input but found 'join' 

如何加入兩個表中艾斯波？

Answer 1

on-select只允許一個命名的窗口或表而不是多個。聯接只是「從A，B，C ...中選擇*」，您可以使用「單向」進行查看。