What are the statements for querying data in mysql?

MySQL query data statements include: SELECT: Retrieve data ORDER BY: Sort query results GROUP BY: Group results by columns HAVING: Filter grouped data

MySQL query data statements

The statements for querying data in MySQL mainly include:

SELECT statement

is used To retrieve data from the database, the basic syntax is as follows:

<code>SELECT column_list
FROM table_name
[WHERE condition];</code>

Where:

• column_list: The list of columns (fields) to be retrieved.
• table_name: The name of the table to retrieve data.
• WHERE condition (optional): Condition for filtering data rows.

ORDER BY statement

is used to sort the query results by the specified column. Its basic syntax is as follows:

<code>SELECT column_list
FROM table_name
[WHERE condition]
ORDER BY column_name ASC/DESC;</code>

Where:

• column_name: The name of the column to be sorted.
• ASC: Sort in ascending order (smallest to largest).
• DESC: Sort in descending order (largest to smallest).

GROUP BY statement

is used to group query results by specified columns. Its basic syntax is as follows:

<code>SELECT column_list, aggregate_function(column_name)
FROM table_name
[WHERE condition]
GROUP BY column_name;</code>

where:

• column_list: The list of columns to retrieve, which must include the grouping column.
• aggregate_function: aggregate function, such as SUM(), COUNT(), MAX(), MIN().
• column_name: Grouping column name.

HAVING statement

is used to filter grouped data. Its basic syntax is as follows:

<code>SELECT column_list, aggregate_function(column_name)
FROM table_name
[WHERE condition]
GROUP BY column_name
HAVING condition;</code>

Among them:

• condition: Condition for filtering grouped data.

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