Merge pull request #245 from yadavan88/escape-keywords

Escape keywords in SQL

Author: milos-simic

sql-queries-7/escape-keyword/escape-mssql.sql

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+-- Create new column with reserved keyword as name
+ALTER TABLE Course add [group] VARCHAR(15);
+
+-- setup some data
+UPDATE Course SET [group] = 'beginner' WHERE department_id = 1 AND credits = 5;
+UPDATE Course SET [group] = 'intermediate' WHERE department_id = 4 AND credits = 5;
+UPDATE Course SET [group] = 'advanced' WHERE credits = 7;
+UPDATE Course SET [group] = 'beginner' WHERE [group] IS NULL;
+
+-- queries
+SELECT DISTINCT [group] FROM Course;
+
+-- reset table
+ALTER TABLE Course DROP COLUMN [group];

sql-queries-7/escape-keyword/escape-mysql.sql

@@ -0,0 +1,14 @@
+-- Create new column with reserved keyword as name
+ALTER TABLE Course add COLUMN `group` VARCHAR(15);
+
+-- setup some data
+UPDATE Course SET `group` = 'beginner' WHERE department_id = 1 AND credits = 5;
+UPDATE Course SET `group` = 'intermediate' WHERE department_id = 4 AND credits = 5;
+UPDATE Course SET `group` = 'advanced' WHERE credits = 7;
+UPDATE Course SET `group` = 'beginner' WHERE `group` IS NULL;
+
+-- queries
+SELECT DISTINCT `group` FROM Course;
+
+-- reset table
+ALTER TABLE Course DROP COLUMN `group`;

sql-queries-7/escape-keyword/escape-pg.sql

@@ -0,0 +1,14 @@
+-- Create new column with reserved keyword as name
+ALTER TABLE course add COLUMN "group" VARCHAR(15);
+
+-- setup some data
+UPDATE course SET "group" = 'beginner' WHERE department_id = 1 AND credits = 5;
+UPDATE course SET "group" = 'intermediate' WHERE department_id = 4 AND credits = 5;
+UPDATE course SET "group" = 'advanced' WHERE credits = 7;
+UPDATE course SET "group" = 'beginner' WHERE "group" IS NULL;
+
+-- queries
+SELECT DISTINCT "group" FROM course;
+
+-- reset table
+ALTER TABLE course DROP COLUMN "group";