I need help explaining this SQL ====================================================== -- Create the view named "WeatherView" CREATE VIEW "WeatherView" AS SELECT "name", "countryCode", "description","temp", "feelsLike", "humidity", "pressure", "sunrise", "sunset", "updatedOn" FROM "City" "c" INNER JOIN "Country" "cn" ON "c"."countryId"= "cn"."countryId" INNER JOIN "weather" "w" ON "w"."cityId"= "c"."cityId"; -- Select all columns from the "WeatherView" view SELECT * from "WeatherView";

I need help explaining this SQL ====================================================== -- Create the view named "WeatherView" CREATE VIEW "WeatherView" AS SELECT "name", "countryCode", "description","temp", "feelsLike", "humidity", "pressure", "sunrise", "sunset", "updatedOn" FROM "City" "c" INNER JOIN "Country" "cn" ON "c"."countryId"= "cn"."countryId" INNER JOIN "weather" "w" ON "w"."cityId"= "c"."cityId"; -- Select all columns from the "WeatherView" view SELECT * from "WeatherView";

Oracle 12c: SQL

3rd Edition

ISBN:9781305251038

Author:Joan Casteel

Publisher:Joan Casteel

Chapter13: Views

Section: Chapter Questions

Problem 8MC

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Oracle 12c: SQL The JustLee DB contains a table called PROMOTION. It does not have any of the relationships to other tables we discussed last week. It is not a one-to-one, one-to-many, or many-to-many relationship. There is no crowfoot on the ER diagram related to this table. However, there IS a relationship depicted in the ER diagram between the PROMOTION and the BOOKS tables. What kind of relationship do you think it is? Please check the structure of these two tables and the data contained in them in your ApEx schema running SQL commands using the clauses you have learned this week. Which commands did you use and what results did you see?
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Need assistance on a MySQL question: Create a trigger named trg_line_prod that automatically updates the quantity on hand for each product sold after a new LINE row is added. My Query: CREATE OR REPLACE TRIGGER trg_line_prod AFTER INSERT ON LINE FOR EACH ROWBEGINUPDATE PRODUCTSET P_QOH= P_QOH - :NEW.LINE_UNITSWHERE PRODUCT.P_CODE = :NEW.P_CODE;END; Error Received: ERROR 1064 (42000) at line 1: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'TRIGGER trg_line_prod AFTER INSERT ON LINE FOR EACH ROW BEGIN UPDATE ' at line 1 Table screenshot attached*
Hello, I have a few questions in regards to SQL Server. It was answered on the website before, but whenever I put the answer in my IDE I get a syntax error, so I will ask here instead for the few I need help with. The topic is MySQL triggers. The first question (or task) is as follows: "Create a trigger named trg_line_total to write the LINE_TOTAL value in the LINE table every time you add a new LINE row. (The LINE_TOTAL value is the product of the LINE_UNITS and LINE_PRICE values.)" An in-depth explanation is appreciated, thank you for your time.
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