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notes in learning #10

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notes in learning #10

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1 change: 0 additions & 1 deletion .vscode/settings.json
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,6 @@
"files.autoSave": "afterDelay",
"screencastMode.onlyKeyboardShortcuts": true,
"terminal.integrated.fontSize": 18,
"workbench.activityBar.visible": true,
"workbench.colorTheme": "Visual Studio Dark",
"workbench.fontAliasing": "antialiased",
"workbench.statusBar.visible": true,
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2 changes: 1 addition & 1 deletion Chapter 2/Finding Duplicate Rows/Duplicate2.sql
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@@ -1,4 +1,4 @@
SELECT FirstName, LastName, COUNT(1)
FROM Customer
GROUP BY FirstName, LastName
HAVING COUNT(1) > 1
HAVING COUNT(1) > 1 -- check duplicate
6 changes: 3 additions & 3 deletions Chapter 2/Finding Inaccurate Data Values/CheckOrderTotal.sql
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@@ -1,8 +1,8 @@
SELECT OrderItem.OrderId,
Orders.TotalDue,
SUM(Price * Quantity) as NewTotalDue
Orders.TotalDue, -- compare totalDue
SUM(Price * Quantity) as NewTotalDue -- with newTortalDue
FROM OrderItem
JOIN Product ON OrderItem.ProductID = Product.ProductID
JOIN Orders ON OrderItem.OrderID = Orders.OrderID
GROUP BY OrderItem.OrderId,
Orders.TotalDue
Orders.TotalDue;
3 changes: 1 addition & 2 deletions Chapter 2/Using Data Types/SelectCustomerOrdersSum.sql
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Expand Up @@ -7,5 +7,4 @@ From Customer
GROUP BY Customer.CustomerID,
FirstName,
LastName
ORDER BY Sum(TotalDue) DESC
LIMIT 10 -- Click on Run on active connection to run
ORDER BY Sum(TotalDue) DESC -- Click on Run on active connection to run
3 changes: 2 additions & 1 deletion Chapter 3/Filtering By Dates/WithCurrentDateMinus10years.sql
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@@ -1,3 +1,4 @@
SELECT OrderID, CreationDate
FROM Orders
Where Year(CreationDate) > (Year(Now()) - 10);
Where Year(CreationDate) > (Year(Now()) - 10);
-- more than past 10 years now
10 changes: 5 additions & 5 deletions Chapter 4/Common SQL String Functions/Trim.sql
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@@ -1,5 +1,5 @@
SELECT TRIM(
'M'
FROM ProductCode
) AS TrimmedProductCode
FROM Product
SELECT TRIM('M'FROM ProductCode) AS TrimmedProductCode
FROM Product;

-- working only leading and trailing
SELECT TRIM('0' FROM ProductCode) FROM Product;