SQL: 此创建视图脚本中的语法错误是什么？（初学者）

Question

我正在尝试创建一个包含两个不同查询的新视图。我是 SQL 的新手，我想知道是什么导致了以下代码的语法错误：

CREATE VIEW `License_Expiration` AS

/* These queries show the license expiration date for retailers and 
processing facilities, sorted by soonest expiration date */

SELECT `Retailers`.`Retailer_Name`, `Retailers`.`Retail_License_Number`, 
`Retailers`.`Retal_License_Expiration` FROM `mydb2`.`Retailers`
ORDER BY `Retailers`.`Retal_License_Expiration`;

SELECT `Processing Facility`.`Facility_Name`, `Processing 
Facility`.`Facility_License_Num`, `Processing 
Facility`.`Facility_License_Exp` FROM `mydb2`.`Processing Facility`
ORDER BY `Processing Facility`.`Facility_License_Exp`;

第二个 SELECT 语句出现语法错误："SELECT is not a valid input at this position"。我正在使用 SQL Workbench。感谢您的帮助！

编辑：您的方案已经解决了，感谢您的帮助！！

Answer 1

您可以创建两个 Views，例如：

CREATE VIEW `License_Expiration_Retailer` AS

/* These queries show the license expiration date for retailers and 
   processing facilities, sorted by soonest expiration date */

SELECT `Retailers`.`Retailer_Name`, 
`Retailers`.`Retail_License_Number`, 
`Retailers`.`Retal_License_Expiration` FROM `mydb2`.`Retailers`
ORDER BY `Retailers`.`Retal_License_Expiration`;


CREATE VIEW `License_Expiration_Processing_Facilities` AS

SELECT `Processing Facility`.`Facility_Name`, `Processing 
Facility`.`Facility_License_Num`, `Processing 
Facility`.`Facility_License_Exp` FROM `mydb2`.`Processing Facility`
ORDER BY `Processing Facility`.`Facility_License_Exp`;

或一个 View合并两者：

CREATE VIEW `License_Expiration` AS

/* These queries show the license expiration date for retailers and 
   processing facilities, sorted by soonest expiration date */

SELECT "Retailer" as License_Type, `Retailers`.`Retailer_Name` as Owner_Name, 
`Retailers`.`Retail_License_Number` as License_Number, 
`Retailers`.`Retal_License_Expiration` as Lincense_Expiration_Date FROM `mydb2`.`Retailers`
ORDER BY `Retailers`.`Retal_License_Expiration`;

UNION ALL

SELECT "Processing Facility" as License_Type, 
`Processing Facility`.`Facility_Name` as OwnerName, `Processing 
Facility`.`Facility_License_Num` as License_Number, `Processing 
Facility`.`Facility_License_Exp` as Lincense_Expiration_Date 
FROM `mydb2`.`Processing Facility`
ORDER BY `Processing Facility`.`Facility_License_Exp`;

Answer 2

您不能像您所做的那样使用两个独立的 SELECT 语句创建视图。根据 MySQL 5.7 文档，视图的语法如下所示。

CREATE
    [OR REPLACE]
    [ALGORITHM = {UNDEFINED | MERGE | TEMPTABLE}]
    [DEFINER = { user | CURRENT_USER }]
    [SQL SECURITY { DEFINER | INVOKER }]
    VIEW view_name [(column_list)]
    AS select_statement
    [WITH [CASCADED | LOCAL] CHECK OPTION]

既然您想要从两种类型（即零售商和设施）获得许可证过期时间，也许您可以 UNION 这两个 SELECT 语句并有一个 CHAR 列来指示记录是否针对零售商或设施。 UNION 假定所有列都是同一类型。

CREATE VIEW `License_Expiration` AS

    /* These queries show the license expiration date for retailers and 
    processing facilities, sorted by soonest expiration date */

    (SELECT `Retailers`.`Retailer_Name`, AS Name,
    `Retailers`.`Retail_License_Number` AS License_Number,
    `Retailers`.`Retal_License_Expiration` AS License_Expiration, 'R'   
    AS Source_Type FROM `mydb2`.`Retailers`)

    UNION

    (SELECT `Processing Facility`.`Facility_Name`, AS Name, 
    `Processing Facility`.`Facility_License_Num` AS License_Number,     
    `Processing Facility`.`Facility_License_Exp` AS License_Expiration,  
    'F' AS Source_Type FROM `mydb2`.`Processing Facility`)

    ORDER BY Name, License Expiration;

希望这对您有所帮助。试一试。

Answer 3

据我所知，您不能在查询中获得多个选择来创建视图。如果您仍然想要两个选择的所有列，请加入这两个表并创建包含必要列的视图，或者您可以根据需要进行联合。

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