在SQL(Structured Query Language)中,您可以使用各種語句和函數來實現不同的功能
SELECT column1, column2 FROM table_name WHERE condition;
INSERT INTO table_name (column1, column2) VALUES (value1, value2);
UPDATE table_name SET column1 = new_value1, column2 = new_value2 WHERE condition;
DELETE FROM table_name WHERE condition;
CREATE TABLE table_name (
column1 data_type,
column2 data_type,
...
);
ALTER TABLE table_name ADD COLUMN new_column data_type;
ALTER TABLE table_name DROP COLUMN column_to_drop;
ALTER TABLE table_name MODIFY COLUMN column_to_modify new_data_type;
DROP TABLE table_name;
SELECT column1, column2, aggregate_function(column3)
FROM table_name
WHERE condition
GROUP BY column1, column2
ORDER BY column1, column2;
SELECT t1.column1, t2.column2
FROM table1 AS t1
JOIN table2 AS t2 ON t1.column1 = t2.column1
WHERE condition;
這只是SQL中可用功能的一小部分。根據您的需求,您可能需要使用更高級的功能,如子查詢、存儲過程、觸發器等。請參閱您正在使用的數據庫管理系統(如MySQL、PostgreSQL、SQL Server等)的文檔以獲取更多信息。