704 lines
51 KiB
HTML
704 lines
51 KiB
HTML
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<h1 class='h1'>MySQL <em>cheatsheet</em></h1>
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<h3 id="create--open--delete-database">Create / Open / Delete Database</h3>
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<pre><code class="language-sql">CREATE DATABASE dbNameYouWant
|
||
CREATE DATABASE dbNameYouWant CHARACTER SET utf8
|
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USE dbNameYouWant
|
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DROP DATABASE dbNameYouWant
|
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ALTER DATABASE dbNameYouWant CHARACTER SET utf8
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</code></pre>
|
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<h3 id="backup-database-to-sql-file">Backup Database to SQL File</h3>
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<pre><code class="language-bash">mysqldump -u Username -p dbNameYouWant > databasename_backup.sql
|
||
</code></pre>
|
||
|
||
<h3 id="restore-from-backup-sql-file">Restore from backup SQL File</h3>
|
||
|
||
<pre><code class="language-bash">mysql - u Username -p dbNameYouWant < databasename_backup.sql
|
||
</code></pre>
|
||
|
||
<h3 id="repair-tables-after-unclean-shutdown">Repair Tables After Unclean Shutdown</h3>
|
||
|
||
<pre><code class="language-bash">mysqlcheck --all-databases
|
||
mysqlcheck --all-databases --fast
|
||
</code></pre>
|
||
|
||
<h3 id="browsing">Browsing</h3>
|
||
|
||
<pre><code class="language-sql">SHOW DATABASES
|
||
SHOW TABLES
|
||
SHOW FIELDS FROM table / DESCRIBE table
|
||
SHOW CREATE TABLE table
|
||
SHOW PROCESSLIST
|
||
KILL process_number
|
||
</code></pre>
|
||
|
||
<h3 id="select">Select</h3>
|
||
|
||
<pre><code class="language-sql">SELECT * FROM table
|
||
SELECT * FROM table1, table2, ...
|
||
SELECT field1, field2, ... FROM table1, table2, ...
|
||
SELECT ... FROM ... WHERE condition
|
||
SELECT ... FROM ... WHERE condition GROUPBY field
|
||
SELECT ... FROM ... WHERE condition GROUPBY field HAVING condition2
|
||
SELECT ... FROM ... WHERE condition ORDER BY field1, field2
|
||
SELECT ... FROM ... WHERE condition ORDER BY field1, field2 DESC
|
||
SELECT ... FROM ... WHERE condition LIMIT 10
|
||
SELECT DISTINCT field1 FROM ...
|
||
SELECT DISTINCT field1, field2 FROM ...
|
||
</code></pre>
|
||
|
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<h3 id="select---join">Select - Join</h3>
|
||
|
||
<pre><code class="language-sql">SELECT ... FROM t1 JOIN t2 ON t1.id1 = t2.id2 WHERE condition
|
||
SELECT ... FROM t1 LEFT JOIN t2 ON t1.id1 = t2.id2 WHERE condition
|
||
SELECT ... FROM t1 JOIN (t2 JOIN t3 ON ...) ON ...
|
||
</code></pre>
|
||
|
||
<h3 id="conditions">Conditions</h3>
|
||
|
||
<pre><code class="language-sql">field1 = value1
|
||
field1 <> value1
|
||
field1 LIKE 'value _ %'
|
||
field1 IS NULL
|
||
field1 IS NOT NULL
|
||
field1 IS IN (value1, value2)
|
||
field1 IS NOT IN (value1, value2)
|
||
condition1 AND condition2
|
||
condition1 OR condition2
|
||
</code></pre>
|
||
|
||
<h3 id="insert">Insert</h3>
|
||
|
||
<pre><code class="language-sql">INSERT INTO table1 (field1, field2, ...) VALUES (value1, value2, ...)
|
||
</code></pre>
|
||
|
||
<h3 id="delete">Delete</h3>
|
||
|
||
<pre><code class="language-sql">DELETE FROM table1 / TRUNCATE table1
|
||
DELETE FROM table1 WHERE condition
|
||
DELETE FROM table1, table2 FROM table1, table2 WHERE table1.id1 =
|
||
table2.id2 AND condition
|
||
</code></pre>
|
||
|
||
<h3 id="update">Update</h3>
|
||
|
||
<pre><code class="language-sql">UPDATE table1 SET field1=new_value1 WHERE condition
|
||
UPDATE table1, table2 SET field1=new_value1, field2=new_value2, ... WHERE
|
||
table1.id1 = table2.id2 AND condition
|
||
</code></pre>
|
||
|
||
<h3 id="create--delete--modify-table">Create / Delete / Modify Table</h3>
|
||
|
||
<h4 id="create">Create</h4>
|
||
|
||
<pre><code class="language-sql">CREATE TABLE table (field1 type1, field2 type2, ...)
|
||
CREATE TABLE table (field1 type1, field2 type2, ..., INDEX (field))
|
||
CREATE TABLE table (field1 type1, field2 type2, ..., PRIMARY KEY (field1))
|
||
CREATE TABLE table (field1 type1, field2 type2, ..., PRIMARY KEY (field1,
|
||
field2))
|
||
</code></pre>
|
||
|
||
<pre><code class="language-sql">CREATE TABLE table1 (fk_field1 type1, field2 type2, ...,
|
||
FOREIGN KEY (fk_field1) REFERENCES table2 (t2_fieldA))
|
||
[ON UPDATE|ON DELETE] [CASCADE|SET NULL]
|
||
</code></pre>
|
||
|
||
<pre><code class="language-sql">CREATE TABLE table1 (fk_field1 type1, fk_field2 type2, ...,
|
||
FOREIGN KEY (fk_field1, fk_field2) REFERENCES table2 (t2_fieldA, t2_fieldB))
|
||
</code></pre>
|
||
|
||
<pre><code class="language-sql">CREATE TABLE table IF NOT EXISTS (...)
|
||
</code></pre>
|
||
|
||
<pre><code class="language-sql">CREATE TEMPORARY TABLE table (...)
|
||
</code></pre>
|
||
|
||
<h4 id="drop">Drop</h4>
|
||
|
||
<pre><code class="language-sql">DROP TABLE table
|
||
DROP TABLE IF EXISTS table
|
||
DROP TABLE table1, table2, ...
|
||
</code></pre>
|
||
|
||
<h4 id="alter">Alter</h4>
|
||
|
||
<pre><code class="language-sql">ALTER TABLE table MODIFY field1 type1
|
||
ALTER TABLE table MODIFY field1 type1 NOT NULL ...
|
||
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1
|
||
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1 NOT NULL ...
|
||
ALTER TABLE table ALTER field1 SET DEFAULT ...
|
||
ALTER TABLE table ALTER field1 DROP DEFAULT
|
||
ALTER TABLE table ADD new_name_field1 type1
|
||
ALTER TABLE table ADD new_name_field1 type1 FIRST
|
||
ALTER TABLE table ADD new_name_field1 type1 AFTER another_field
|
||
ALTER TABLE table DROP field1
|
||
ALTER TABLE table ADD INDEX (field);
|
||
</code></pre>
|
||
|
||
<h4 id="change-field-order">Change field order</h4>
|
||
|
||
<pre><code class="language-sql">ALTER TABLE table MODIFY field1 type1 FIRST
|
||
ALTER TABLE table MODIFY field1 type1 AFTER another_field
|
||
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1 FIRST
|
||
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1 AFTER
|
||
another_field
|
||
</code></pre>
|
||
|
||
<h3 id="keys">Keys</h3>
|
||
|
||
<pre><code class="language-sql">CREATE TABLE table (..., PRIMARY KEY (field1, field2))
|
||
CREATE TABLE table (..., FOREIGN KEY (field1, field2) REFERENCES table2
|
||
(t2_field1, t2_field2))
|
||
</code></pre>
|
||
|
||
<h3 id="users-and-privileges">Users and Privileges</h3>
|
||
|
||
<pre><code class="language-sql">GRANT ALL PRIVILEGES ON base.* TO 'user'@'localhost' IDENTIFIED BY 'password';
|
||
GRANT SELECT, INSERT, DELETE ON base.* TO 'user'@'localhost' IDENTIFIED BY 'password';
|
||
REVOKE ALL PRIVILEGES ON base.* FROM 'user'@'host'; -- one permission only
|
||
REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'user'@'host'; -- all permissions
|
||
</code></pre>
|
||
|
||
<pre><code class="language-sql">SET PASSWORD = PASSWORD('new_pass')
|
||
SET PASSWORD FOR 'user'@'host' = PASSWORD('new_pass')
|
||
SET PASSWORD = OLD_PASSWORD('new_pass')
|
||
</code></pre>
|
||
|
||
<pre><code class="language-sql">DROP USER 'user'@'host'
|
||
</code></pre>
|
||
|
||
<p>Host ‘%’ indicates any host.</p>
|
||
|
||
<h3 id="main-data-types">Main Data Types</h3>
|
||
|
||
<pre><code class="language-sql">TINYINT (1o: -217+128)
|
||
SMALLINT (2o: +-65 000)
|
||
MEDIUMINT (3o: +-16 000 000)
|
||
INT (4o: +- 2 000 000 000)
|
||
BIGINT (8o: +-9.10^18)
|
||
</code></pre>
|
||
|
||
<pre><code class="language-sql">Precise interval: -(2^(8*N-1)) -> (2^8*N)-1
|
||
</code></pre>
|
||
|
||
<p>⚠ INT(2) = “2 digits displayed” – NOT “number with 2 digits max”</p>
|
||
|
||
<pre><code class="language-sql">FLOAT(M,D)
|
||
DOUBLE(M,D)
|
||
FLOAT(D=0->53)
|
||
</code></pre>
|
||
|
||
<p>⚠ 8,3 -> 12345,678 – NOT 12345678,123!</p>
|
||
|
||
<pre><code class="language-sql">TIME (HH:MM)
|
||
YEAR (AAAA)
|
||
DATE (AAAA-MM-JJ)
|
||
DATETIME (AAAA-MM-JJ HH:MM; années 1000->9999)
|
||
TIMESTAMP (like DATETIME, but 1970->2038, compatible with Unix)
|
||
</code></pre>
|
||
|
||
<pre><code class="language-sql">VARCHAR (single-line; explicit size)
|
||
TEXT (multi-lines; max size=65535)
|
||
BLOB (binary; max size=65535)
|
||
</code></pre>
|
||
|
||
<p>Variants for TEXT&BLOB: <code>TINY</code> (max=255), <code>MEDIUM</code> (max=~16000), and <code>LONG</code> (max=4Go). Ex: <code>VARCHAR(32)</code>, <code>TINYTEXT</code>, <code>LONGBLOB</code>, <code>MEDIUMTEXT</code></p>
|
||
|
||
<pre><code class="language-sql">ENUM ('value1', 'value2', ...) -- (default NULL, or '' if NOT NULL)
|
||
</code></pre>
|
||
|
||
<h3 id="reset-root-password">Reset Root Password</h3>
|
||
|
||
<pre><code class="language-bash">$ /etc/init.d/mysql stop
|
||
</code></pre>
|
||
|
||
<pre><code class="language-bash">$ mysqld_safe --skip-grant-tables
|
||
</code></pre>
|
||
|
||
<pre><code class="language-bash">$ mysql # on another terminal
|
||
mysql> UPDATE mysql.user SET password=PASSWORD('new_pass') WHERE user='root';
|
||
</code></pre>
|
||
|
||
<pre><code class="language-bash">## Switch back to the mysqld_safe terminal and kill the process using Control + \
|
||
$ /etc/init.d/mysql start
|
||
</code></pre>
|
||
|
||
<p>Your commands may vary depending on your OS.</p>
|
||
|
||
</main>
|
||
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|
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cheatsheet
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cheatsheet
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<a href='./react'>
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<strong>React.js</strong>
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