From 709c4567228f2040328be1c1747f5b211dd496b5 Mon Sep 17 00:00:00 2001 From: Matt Huntington Date: Sun, 14 Feb 2016 12:37:44 -0500 Subject: [PATCH] Update MySQLNotes.md --- MySQLNotes.md | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/MySQLNotes.md b/MySQLNotes.md index 922b4c8..0f68893 100644 --- a/MySQLNotes.md +++ b/MySQLNotes.md @@ -22,7 +22,7 @@ SHOW DATABASES; CREATE DATABASE users; USE users; -CREATE TABLE employees (NAME VARCHAR(20), age INT); +CREATE TABLE employees (first_name VARCHAR(20), age INT); DESCRIBE employees; -- CRUD @@ -38,8 +38,8 @@ SELECT * FROM employees WHERE age < 63; SELECT * FROM employees WHERE age > 63; SELECT * FROM employees WHERE age >= 63; SELECT * FROM employees WHERE age <= 63; -SELECT * FROM employees WHERE NAME first_name LIKE "%Charlie%"; -SELECT * FROM employees WHERE NAME first_name NOT LIKE "%Charlie%"; +SELECT * FROM employees WHERE first_name first_name LIKE "%Charlie%"; +SELECT * FROM employees WHERE first_name NOT LIKE "%Charlie%"; SELECT * FROM employees WHERE age IS NULL; SELECT * FROM employees WHERE age IS NOT NULL; @@ -52,12 +52,12 @@ SELECT * FROM users WHERE first_name = 'Matt' OR age = 49; SELECT * FROM employees ORDER BY age DESC; SELECT * FROM employees ORDER BY age ASC LIMIT 2; SELECT * FROM employees ORDER BY age ASC LIMIT 2 OFFSET 1; -SELECT * FROM employees ORDER BY age DESC, NAME ASC; +SELECT * FROM employees ORDER BY age DESC, first_name ASC; -- ALTER TABLE ALTER TABLE employees ADD COLUMN weight FLOAT; ALTER TABLE employees DROP COLUMN height; -ALTER TABLE employees ADD COLUMN height FLOAT AFTER NAME; +ALTER TABLE employees ADD COLUMN height FLOAT AFTER first_name; ALTER TABLE employees MODIFY COLUMN height FLOAT AFTER age; ALTER TABLE employees ADD COLUMN id INT FIRST; ALTER TABLE employees ADD COLUMN dob DATETIME; @@ -72,7 +72,7 @@ SELECT AVG(age) FROM employees; SELECT MIN(age) FROM employees; SELECT MAX(age) FROM employees; SELECT GROUP_CONCAT(age) FROM employees; -SELECT GROUP_CONCAT(age) FROM employees, name; +SELECT GROUP_CONCAT(age) FROM employees, first_name; -- JOINS SELECT * from employees FULL JOIN companies;