SQL命令的正確使用方式取決于具體的需求和數據庫管理系統。以下是一些常用的SQL命令和示例用法：
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
...
);
INSERT INTO table_name (column1, column2, ...)
VALUES (value1, value2, ...);
SELECT column1, column2, ...
FROM table_name
WHERE condition;
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;
DELETE FROM table_name
WHERE condition;
SELECT column1, column2, ...
FROM table1
INNER JOIN table2 ON table1.column = table2.column;
SELECT COUNT(column_name) FROM table_name;
SELECT AVG(column_name) FROM table_name;
SELECT MAX(column_name) FROM table_name;
SELECT MIN(column_name) FROM table_name;
以上是一些基本的SQL命令和用法，您可以根據具體情況靈活運用。對于更復雜的查詢和操作，您可能需要深入學習SQL語法和理解數據庫管理系統的特性。
