From 6283d200c8352a8c109924ec8a3869e2f9c92f95 Mon Sep 17 00:00:00 2001 From: rafaelborgesleal Date: Wed, 3 Sep 2025 23:57:04 +0000 Subject: [PATCH 1/9] Save --- .vscode/settings.json | 1 - SOURCE | 0 Selfstudy/SelectLastNameAndOrderID.sql | 4 ++++ mydb.db | 0 4 files changed, 4 insertions(+), 1 deletion(-) create mode 100644 SOURCE create mode 100644 Selfstudy/SelectLastNameAndOrderID.sql create mode 100644 mydb.db diff --git a/.vscode/settings.json b/.vscode/settings.json index 66874f2..eceb2a3 100644 --- a/.vscode/settings.json +++ b/.vscode/settings.json @@ -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, diff --git a/SOURCE b/SOURCE new file mode 100644 index 0000000..e69de29 diff --git a/Selfstudy/SelectLastNameAndOrderID.sql b/Selfstudy/SelectLastNameAndOrderID.sql new file mode 100644 index 0000000..496c5a4 --- /dev/null +++ b/Selfstudy/SelectLastNameAndOrderID.sql @@ -0,0 +1,4 @@ +SELECT LastName, + OrderId +FROM Customer + JOIN Orders on Customer.CustomerID = Orders.CustomerId \G \ No newline at end of file diff --git a/mydb.db b/mydb.db new file mode 100644 index 0000000..e69de29 From e621295c436a0da8feed4d3c7034ae532a70f2ce Mon Sep 17 00:00:00 2001 From: rafaelborgesleal Date: Thu, 4 Sep 2025 00:42:00 +0000 Subject: [PATCH 2/9] Save --- Selfstudy/SelectLastNameAndOrderID.sql | 2 +- Selfstudy/SelectLastNameAndOrderID.txt | 201 +++++++++++++++++++++++++ 2 files changed, 202 insertions(+), 1 deletion(-) create mode 100644 Selfstudy/SelectLastNameAndOrderID.txt diff --git a/Selfstudy/SelectLastNameAndOrderID.sql b/Selfstudy/SelectLastNameAndOrderID.sql index 496c5a4..f0d24c4 100644 --- a/Selfstudy/SelectLastNameAndOrderID.sql +++ b/Selfstudy/SelectLastNameAndOrderID.sql @@ -1,4 +1,4 @@ SELECT LastName, OrderId FROM Customer - JOIN Orders on Customer.CustomerID = Orders.CustomerId \G \ No newline at end of file + JOIN Orders on Customer.CustomerID = Orders.CustomerId; \ No newline at end of file diff --git a/Selfstudy/SelectLastNameAndOrderID.txt b/Selfstudy/SelectLastNameAndOrderID.txt new file mode 100644 index 0000000..9a7387f --- /dev/null +++ b/Selfstudy/SelectLastNameAndOrderID.txt @@ -0,0 +1,201 @@ +LastName OrderId +Mcdonald 1195 +Clark 1189 +Ramirez 1021 +Meyer 1088 +Palmer 1073 +Alexander 1142 +Howard 1027 +Howard 1171 +Gibson 1001 +Carter 1060 +Carter 1163 +Watkins 1056 +Graham 1036 +Mccoy 1092 +Jordan 1084 +Hicks 1155 +Jacobs 1101 +Jacobs 1116 +Taylor 1141 +Cooper 1065 +Jordan 1121 +Henderson 1119 +Cook 1014 +Scott 1113 +Freeman 1123 +Bell 1149 +Perez 1029 +Gilbert 1052 +Ramos 1153 +Garcia 1110 +Gonzales 1138 +Anderson 1070 +Rivera 1040 +Wallace 1114 +Fisher 1089 +Morrison 1007 +Campbell 1129 +Johnston 1178 +Dean 1177 +Welch 1018 +Welch 1185 +Kennedy 1068 +Foster 1165 +Gutierrez 1179 +Campbell 1188 +Warren 1037 +Robertson 1025 +Johnston 1161 +Brooks 1191 +Elliott 1059 +Marshall 1057 +Garcia 1164 +Price 1160 +Franklin 1173 +Wheeler 1028 +Powell 1148 +Hernandez 1111 +Crawford 1000 +Morrison 1082 +Morrison 1115 +Hanson 1186 +Holmes 1168 +Ross 1151 +Lawrence 1104 +Lopez 1100 +Porter 1085 +Cunningham 1124 +Turner 1095 +Roberts 1086 +Mitchell 1032 +Mitchell 1080 +Ramos 1176 +Henry 1181 +Martinez 1019 +Robertson 1063 +Crawford 1098 +Grant 1079 +Matthews 1136 +Johnston 1158 +Wood 1193 +Shaw 1074 +Shaw 1159 +Gordon 1091 +Hansen 1132 +Snyder 1135 +Carpenter 1017 +Willis 1122 +Willis 1184 +Campbell 1023 +Campbell 1030 +Weaver 1075 +Lopez 1076 +Hamilton 1034 +Medina 1169 +Thomas 1097 +Gardner 1006 +Reid 1128 +Lee 1127 +Scott 1152 +Barnes 1044 +Hansen 1010 +Hansen 1172 +Johnson 1125 +Porter 1061 +Walker 1015 +Stephens 1054 +Stephens 1105 +Arnold 1167 +Jones 1145 +Thompson 1199 +Lawson 1041 +Jordan 1069 +Schmidt 1126 +Davis 1066 +Riley 1038 +Brooks 1147 +Collins 1197 +Moreno 1077 +Pierce 1035 +Pierce 1062 +Anderson 1182 +Wood 1154 +Howard 1049 +Howard 1144 +Martinez 1106 +Reed 1146 +Gibson 1012 +Myers 1140 +Martin 1108 +Rice 1174 +Peterson 1143 +Watkins 1170 +Adams 1043 +Grant 1009 +Grant 1064 +Graham 1002 +Graham 1130 +Dunn 1026 +Alexander 1005 +Young 1083 +Nguyen 1078 +Young 1087 +Howard 1109 +Lopez 1011 +Hughes 1156 +Dunn 1180 +Foster 1112 +Foster 1139 +Ferguson 1102 +Cunningham 1008 +Ross 1042 +Mills 1137 +Mills 1194 +Howell 1175 +Dunn 1067 +Castillo 1071 +Castillo 1031 +Evans 1196 +Montgomery 1004 +Montgomery 1090 +Scott 1072 +Hernandez 1051 +Clark 1103 +Chavez 1157 +Castillo 1133 +Knight 1096 +Daniels 1093 +Nelson 1190 +Spencer 1033 +Jones 1055 +Rose 1134 +Rose 1150 +Reyes 1162 +Ferguson 1020 +Ferguson 1099 +Adams 1048 +Hart 1117 +Ramos 1192 +Andrews 1107 +Johnston 1131 +Taylor 1198 +Carpenter 1022 +Carpenter 1050 +Cooper 1003 +Brooks 1047 +Frazier 1024 +Martin 1046 +Cooper 1183 +Bennett 1081 +Robinson 1187 +Harper 1045 +Henry 1166 +Franklin 1094 +Arnold 1039 +Snyder 1053 +Nelson 1120 +Matthews 1058 +Alvarez 1016 +Carter 1013 +Gonzalez 1118 From 67efe91fc903c4d83c6c1865e89f80efc4d9cc53 Mon Sep 17 00:00:00 2001 From: rafaelborgesleal Date: Thu, 4 Sep 2025 18:33:39 +0000 Subject: [PATCH 3/9] Save --- Selfstudy/SelectLastNameAndOrderID.sql | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/Selfstudy/SelectLastNameAndOrderID.sql b/Selfstudy/SelectLastNameAndOrderID.sql index f0d24c4..7187296 100644 --- a/Selfstudy/SelectLastNameAndOrderID.sql +++ b/Selfstudy/SelectLastNameAndOrderID.sql @@ -1,4 +1,6 @@ SELECT LastName, OrderId FROM Customer - JOIN Orders on Customer.CustomerID = Orders.CustomerId; \ No newline at end of file +-- Join the Orders table to the Customer table + JOIN Orders + on Customer.CustomerID = Orders.CustomerId; \ No newline at end of file From 737344e79573f5d0f775c391082bca4a840580ff Mon Sep 17 00:00:00 2001 From: rafaelborgesleal Date: Thu, 4 Sep 2025 19:31:51 +0000 Subject: [PATCH 4/9] Save --- Chapter 2/Finding Duplicate Rows/Duplicate1.sql | 3 +++ Selfstudy/DataBaseGeneralView.sql | 0 2 files changed, 3 insertions(+) create mode 100644 Selfstudy/DataBaseGeneralView.sql diff --git a/Chapter 2/Finding Duplicate Rows/Duplicate1.sql b/Chapter 2/Finding Duplicate Rows/Duplicate1.sql index 6d4dfd5..26e418e 100644 --- a/Chapter 2/Finding Duplicate Rows/Duplicate1.sql +++ b/Chapter 2/Finding Duplicate Rows/Duplicate1.sql @@ -1,8 +1,11 @@ +-- Select the customer information and how many orders they have SELECT Customer.CustomerID, Customer.FirstName, Customer.LastName, + -- Total number of orders for each customer COUNT(1) as NUM_ORDERS FROM Customer +-- Start with the Customer table, Join with the Orders table, matching each customer to their orders JOIN Orders ON Customer.CustomerID = Orders.CustomerID GROUP BY Customer.CustomerID, Customer.FirstName, diff --git a/Selfstudy/DataBaseGeneralView.sql b/Selfstudy/DataBaseGeneralView.sql new file mode 100644 index 0000000..e69de29 From 246cb7337222302e2d2b9a51857189511c4d2ffc Mon Sep 17 00:00:00 2001 From: rafaelborgesleal Date: Thu, 4 Sep 2025 19:41:57 +0000 Subject: [PATCH 5/9] Save --- Chapter 2/Finding Duplicate Rows/Test.csv | 180 ++++++++++++++++++++++ 1 file changed, 180 insertions(+) create mode 100644 Chapter 2/Finding Duplicate Rows/Test.csv diff --git a/Chapter 2/Finding Duplicate Rows/Test.csv b/Chapter 2/Finding Duplicate Rows/Test.csv new file mode 100644 index 0000000..5b8c533 --- /dev/null +++ b/Chapter 2/Finding Duplicate Rows/Test.csv @@ -0,0 +1,180 @@ +"CustomerID","FirstName","LastName","NUM_ORDERS" +822,"Mary","Foster","2" +846,"Julie","Mills","2" +555,"Sandra","Willis","2" +653,"Frank","Hansen","2" +666,"Alan","Stephens","2" +717,"Catherine","Pierce","2" +789,"Ronald","Grant","2" +916,"Melissa","Rose","2" +133,"Earl","Carter","2" +292,"Roger","Welch","2" +469,"Emily","Mitchell","2" +561,"Kelly","Campbell","2" +791,"Nancy","Graham","2" +866,"Frank","Montgomery","2" 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100644 index 5b8c533..0000000 --- a/Chapter 2/Finding Duplicate Rows/Test.csv +++ /dev/null @@ -1,180 +0,0 @@ -"CustomerID","FirstName","LastName","NUM_ORDERS" -822,"Mary","Foster","2" -846,"Julie","Mills","2" -555,"Sandra","Willis","2" -653,"Frank","Hansen","2" -666,"Alan","Stephens","2" -717,"Catherine","Pierce","2" -789,"Ronald","Grant","2" -916,"Melissa","Rose","2" -133,"Earl","Carter","2" -292,"Roger","Welch","2" -469,"Emily","Mitchell","2" -561,"Kelly","Campbell","2" -791,"Nancy","Graham","2" -866,"Frank","Montgomery","2" -971,"Pamela","Carpenter","2" -925,"Gary","Ferguson","2" -126,"James","Howard","2" -153,"Matthew","Jacobs","2" -415,"Bruce","Morrison","2" -529,"Charles","Shaw","2" -734,"Cynthia","Howard","2" -758,"Louis","Martin","1" -783,"Brandon","Adams","1" -798,"Lillian","Alexander","1" -810,"Diane","Howard","1" -859,"Mildred","Castillo","1" -883,"Melissa","Hernandez","1" -903,"Christina","Knight","1" -915,"Louise","Jones","1" -929,"Shawn","Adams","1" 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-661,"Nancy","Walker","1" -672,"Sharon","Thompson","1" -695,"Stephen","Davis","1" -714,"Kimberly","Moreno","1" -752,"Arthur","Myers","1" From 35528cac384337f13139cfa0d58bd7115a59179f Mon Sep 17 00:00:00 2001 From: rafaelborgesleal Date: Fri, 5 Sep 2025 23:21:51 +0000 Subject: [PATCH 7/9] Save --- .../Finding Duplicate Rows/Duplicate1.csv | 180 ++++++++++++++++++ .../Finding Duplicate Rows/Duplicate1.sql | 7 +- .../Finding Duplicate Rows/Duplicate2.csv | 10 + .../Finding Duplicate Rows/Duplicate2.sql | 9 +- .../Finding Duplicate Rows/Duplicate3.sql | 15 +- .../Finding Duplicate Rows/Duplicate4.csv | 17 ++ .../Finding Duplicate Rows/Duplicate4.sql | 9 + 7 files changed, 239 insertions(+), 8 deletions(-) create mode 100644 Chapter 2/Finding Duplicate Rows/Duplicate1.csv create mode 100644 Chapter 2/Finding Duplicate Rows/Duplicate2.csv create mode 100644 Chapter 2/Finding Duplicate Rows/Duplicate4.csv create mode 100644 Chapter 2/Finding Duplicate Rows/Duplicate4.sql diff --git a/Chapter 2/Finding Duplicate Rows/Duplicate1.csv b/Chapter 2/Finding Duplicate Rows/Duplicate1.csv new file mode 100644 index 0000000..703432c --- /dev/null +++ b/Chapter 2/Finding Duplicate Rows/Duplicate1.csv @@ -0,0 +1,180 @@ +"CustomerID","FirstName","LastName","NUM_ORDERS" +133,"Earl","Carter","2" +292,"Roger","Welch","2" +469,"Emily","Mitchell","2" +561,"Kelly","Campbell","2" +789,"Ronald","Grant","2" +916,"Melissa","Rose","2" +791,"Nancy","Graham","2" +866,"Frank","Montgomery","2" +971,"Pamela","Carpenter","2" +126,"James","Howard","2" +153,"Matthew","Jacobs","2" +415,"Bruce","Morrison","2" +529,"Charles","Shaw","2" +734,"Cynthia","Howard","2" +925,"Gary","Ferguson","2" +555,"Sandra","Willis","2" +653,"Frank","Hansen","2" +666,"Alan","Stephens","2" +717,"Catherine","Pierce","2" +822,"Mary","Foster","2" +846,"Julie","Mills","2" +107,"Brian","Mcdonald","1" +122,"Jean","Palmer","1" +141,"Elizabeth","Jordan","1" +157,"Sarah","Cooper","1" +189,"Ryan","Scott","1" +204,"Donald","Gilbert","1" 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+903,"Christina","Knight","1" +915,"Louise","Jones","1" +929,"Shawn","Adams","1" +955,"Lawrence","Johnston","1" +977,"Christopher","Brooks","1" +1002,"Shawn","Bennett","1" +1055,"Jesse","Franklin","1" +1071,"Cynthia","Matthews","1" diff --git a/Chapter 2/Finding Duplicate Rows/Duplicate1.sql b/Chapter 2/Finding Duplicate Rows/Duplicate1.sql index 26e418e..c1970df 100644 --- a/Chapter 2/Finding Duplicate Rows/Duplicate1.sql +++ b/Chapter 2/Finding Duplicate Rows/Duplicate1.sql @@ -1,13 +1,16 @@ -- Select the customer information and how many orders they have SELECT Customer.CustomerID, - Customer.FirstName, + Customer.FirstName, Customer.LastName, -- Total number of orders for each customer COUNT(1) as NUM_ORDERS FROM Customer -- Start with the Customer table, Join with the Orders table, matching each customer to their orders JOIN Orders ON Customer.CustomerID = Orders.CustomerID -GROUP BY Customer.CustomerID, +-- Group rows so that each customer is one line in the result +-- Required because we've using count() + GROUP BY Customer.CustomerID, Customer.FirstName, Customer.LastName +-- Sort the result by number of orders (Highest first) ORDER BY NUM_ORDERS DESC \ No newline at end of file diff --git a/Chapter 2/Finding Duplicate Rows/Duplicate2.csv b/Chapter 2/Finding Duplicate Rows/Duplicate2.csv new file mode 100644 index 0000000..321be49 --- /dev/null +++ b/Chapter 2/Finding Duplicate Rows/Duplicate2.csv @@ -0,0 +1,10 @@ +"FirstName","LastName","-- Number of rows for each (FirstName, LastName) Combination + COUNT(1)" +"Brandon","Murray","2" +"Carolyn","Welch","2" +"Christopher","Brooks","2" +"Cynthia","Greene","2" +"Frances","Jones","2" +"Lori","Harris","2" +"Randy","Gonzales","2" +"Randy","Parker","2" diff --git a/Chapter 2/Finding Duplicate Rows/Duplicate2.sql b/Chapter 2/Finding Duplicate Rows/Duplicate2.sql index f70013a..5389e8e 100644 --- a/Chapter 2/Finding Duplicate Rows/Duplicate2.sql +++ b/Chapter 2/Finding Duplicate Rows/Duplicate2.sql @@ -1,4 +1,9 @@ -SELECT FirstName, LastName, COUNT(1) +SELECT FirstName, + LastName, + -- Number of rows for each (FirstName, LastName) Combination + COUNT(1) FROM Customer -GROUP BY FirstName, LastName +GROUP BY FirstName, + LastName + -- Only keep groups where the count is greater than 1 HAVING COUNT(1) > 1 \ No newline at end of file diff --git a/Chapter 2/Finding Duplicate Rows/Duplicate3.sql b/Chapter 2/Finding Duplicate Rows/Duplicate3.sql index b1484da..2e029d0 100644 --- a/Chapter 2/Finding Duplicate Rows/Duplicate3.sql +++ b/Chapter 2/Finding Duplicate Rows/Duplicate3.sql @@ -1,15 +1,22 @@ -SELECT FirstName, +-- Select customer identity details and count how many times +-- each unique combination of these fields appears +SELECT + FirstName, LastName, Address, City, State, Zipcode, - COUNT(1) + COUNT(1) -- number of rows that share the exact same values FROM Customer -GROUP BY FirstName, +GROUP BY + FirstName, LastName, Address, City, State, Zipcode -HAVING COUNT(1) > 1 \ No newline at end of file +-- Keep only the groups that appear more than once. +-- In other words, only return customers where *all six fields* +-- are duplicated across multiple rows. +HAVING COUNT(1) > 1; \ No newline at end of file diff --git a/Chapter 2/Finding Duplicate Rows/Duplicate4.csv b/Chapter 2/Finding Duplicate Rows/Duplicate4.csv new file mode 100644 index 0000000..ce0cd6e --- /dev/null +++ b/Chapter 2/Finding Duplicate Rows/Duplicate4.csv @@ -0,0 +1,17 @@ +"CustomerID","FirstName","LastName" +704,"Christopher","Brooks" +977,"Christopher","Brooks" +508,"Randy","Gonzales" +651,"Randy","Gonzales" +557,"Cynthia","Greene" +650,"Cynthia","Greene" +601,"Lori","Harris" +888,"Lori","Harris" +394,"Frances","Jones" +501,"Frances","Jones" +152,"Brandon","Murray" +559,"Brandon","Murray" +234,"Randy","Parker" +894,"Randy","Parker" +403,"Carolyn","Welch" +1070,"Carolyn","Welch" diff --git a/Chapter 2/Finding Duplicate Rows/Duplicate4.sql b/Chapter 2/Finding Duplicate Rows/Duplicate4.sql new file mode 100644 index 0000000..e98c75a --- /dev/null +++ b/Chapter 2/Finding Duplicate Rows/Duplicate4.sql @@ -0,0 +1,9 @@ +SELECT c.CustomerID, c.FirstName, c.LastName +FROM Customer c +JOIN ( + SELECT FirstName, LastName + FROM Customer + GROUP BY FirstName, LastName + HAVING COUNT(*) > 1 +) d ON d.FirstName = c.FirstName AND d.LastName = c.LastName +ORDER BY c.LastName, c.FirstName, c.CustomerID; From 2b2ee0182c8272754eaa9597c55f9cd81a563859 Mon Sep 17 00:00:00 2001 From: rafaelborgesleal Date: Fri, 5 Sep 2025 23:22:21 +0000 Subject: [PATCH 8/9] Save --- .vscode/settings.json | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/.vscode/settings.json b/.vscode/settings.json index eceb2a3..3e74749 100644 --- a/.vscode/settings.json +++ b/.vscode/settings.json @@ -35,5 +35,8 @@ "password": "mariadb" } ], - "sqltools.useNodeRuntime": true + "sqltools.useNodeRuntime": true, + "githubPullRequests.ignoredPullRequestBranches": [ + "main" + ] } \ No newline at end of file From 245d3af06cf04a51a2c461a3c1d06d405804e2e5 Mon Sep 17 00:00:00 2001 From: rafaelborgesleal Date: Tue, 9 Sep 2025 19:18:33 +0000 Subject: [PATCH 9/9] Save --- .../CheckOrderTotal.sql | 25 +++++++++++++------ 1 file changed, 18 insertions(+), 7 deletions(-) diff --git a/Chapter 2/Finding Inaccurate Data Values/CheckOrderTotal.sql b/Chapter 2/Finding Inaccurate Data Values/CheckOrderTotal.sql index 64089b3..06e6e27 100644 --- a/Chapter 2/Finding Inaccurate Data Values/CheckOrderTotal.sql +++ b/Chapter 2/Finding Inaccurate Data Values/CheckOrderTotal.sql @@ -1,8 +1,19 @@ -SELECT OrderItem.OrderId, - Orders.TotalDue, - SUM(Price * Quantity) as NewTotalDue +-- Select order-level information and recalculate totals from items +SELECT + OrderItem.OrderId, -- the ID of the order + Orders.TotalDue, -- the total amount stored in the Orders + SUM(Price * Quantity) as NewTotalDue -- new total, calculated by summing each +-- product's price X quantity +-- Start from the OrderItem table (contains line items of each order) FROM OrderItem - JOIN Product ON OrderItem.ProductID = Product.ProductID - JOIN Orders ON OrderItem.OrderID = Orders.OrderID -GROUP BY OrderItem.OrderId, - Orders.TotalDue \ No newline at end of file +-- Bring in product information, to get the Price for each item + JOIN Product + ON OrderItem.ProductID = Product.ProductID +-- Bring in order-level information (e.g. stored TotalDue) + JOIN Orders + ON OrderItem.OrderID = Orders.OrderID +-- Group results so that each order is represented once +-- Required because we're using SUM() across multiple order items +GROUP BY + OrderItem.OrderId, + Orders.TotalDue; \ No newline at end of file