SQL Updates cheat sheet (MySQL, Postgres) - #

 


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Synchronous vs Asynchronous Programming

 Synchronous: Code execution blocks until a task completes.

Asynchronous: Code execution can continue while a task is still running, 

leading to better resource utilization and responsiveness.

SQL Commands - essentials

 

SELECT


# Retrieve data from the database


FROM


# Specify the table to select data from


WHERE


# Filter rows based on a condition


AS


# Rename a column or table with an alias


JOIN


# Combine rows from two or more tables


ON


# Specify the condition for a JOIN


AND


# Combine multiple conditions, all must be true


OR


# Combine multiple conditions, at least one must be true


LIMIT


# Restrict the number of rows returned


IN


# Specify multiple values in a WHERE clause


CASE


# Create conditional logic within a SQL statement


IS NULL


# Check for empty or NULL values


ORDER BY #


Sort the result set by one or more columns


GROUP BY #


Group rows that share a property into summary rows


HAVING


# Filter groups based on conditions


INSERT INTO


# Add new records to a table


VALUES #


Specify values to insert into the table


UPDATE


# Modify existing records in a table


SET


# Specify the columns and values to update


DELETE


# Remove records from a table


ALTER


# Modify the structure of a table (e.g., add or drop columns)


DROP


# Delete tables, databases, or indexes


DISTINCT


# Retrieve unique values from a column


TRUNCATE #


Delete all records from a table (but keep the structure)


UNION


# Combine the result sets of two or more SELECT queries



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