Written by me@grafxflow
12 Mar, 2011
0
2,784
Here are some tips that can really be helpful for MYSQL queries... quick reference.
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= |
Equals |
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< |
Less than |
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<= |
Less than or equal to |
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> |
Greater than |
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>= |
Greater than or equal to |
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<> |
Not equal to |
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!= |
Not equal to |
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LIKE |
Compare strings |
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( ) |
Use parentheses to force precedence |
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+ |
add |
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- |
subtract |
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* |
multiply |
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/ |
divide |
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% |
modulo |
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|| |
Logical "or" |
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| |
Bitwise "or" |
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OR |
Same as Logical "or" |
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&& |
Logical "and" |
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& |
Bitwise "and" |
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AND |
Same as Logical "and" |
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CONCAT(str1,str2) |
Concatenates strings |
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DAYNAME(date) |
Returns the dayname for the given date |
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LAST_INSERT_ID( ) |
Returns the last record ID inserted |
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LENGTH(column) |
Returns the length of a string in characters |
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TRUNCATE(n,n) |
Returns stated number of decimal places |
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UNIX_TIMESTAMP( ) |
Returns the epoch |
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AVG(column) |
Average number from returned results |
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MAX(column) |
Returns the largest number from returned results |
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MIN(column) |
Returns the smallest number from returned results |
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SUM(column) |
Returns the sum of all returned results |
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USE database |
Selecting a database |
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SHOW DATABASES |
Listing databases |
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SHOW TABLES |
Listing tables in a db |
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DESCRIBE table |
Describing the format of a table |
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CREATE DATABASE db_name |
Creating a database |
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CREATE TABLE table_name (field1_name TYPE(SIZE), field2_name TYPE(SIZE)); |
Creating a table Example: CREATE TABLE person (name VARCHAR(20), sex CHAR(1), birth DATE) |
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SELECT DATABASE() |
Currently selected database |
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ALTER TABLE tbl ADD COLUMN [column_create syntax] AFTER col_name |
Adding a column to an already-created table |
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ALTER TABLE tbl DROP COLUMN col |
Removing a column |
12 Jan, 2010
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I am a Full-stack Developer who also started delving into the world of UX/UI Design a few years back. I blog and tweet to hopefully share a little bit of knowledge that can help others around the web. Thanks for stopping by!
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