SQL server的基本sql语句
时间: 2024-05-31 15:08:55 浏览: 14
1. 创建表
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
column3 datatype,
.....
);
2. 查询数据
SELECT column1, column2, column3, ...
FROM table_name
WHERE condition;
3. 插入数据
INSERT INTO table_name (column1, column2, column3, ...)
VALUES (value1, value2, value3, ...);
4. 更新数据
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;
5. 删除数据
DELETE FROM table_name
WHERE condition;
6. 排序数据
SELECT column1, column2, ...
FROM table_name
ORDER BY column1 [ASC|DESC], column2 [ASC|DESC], ...;
7. 分组数据
SELECT column1, SUM(column2)
FROM table_name
GROUP BY column1;
8. 连接数据
SELECT column1, column2, ...
FROM table_name1
JOIN table_name2
ON table_name1.column_name = table_name2.column_name;
9. 嵌套查询
SELECT column1, column2, ...
FROM table_name
WHERE column_name IN (SELECT column_name FROM table_name WHERE condition);
10. 聚合函数
SELECT COUNT(column_name)
FROM table_name
WHERE condition;
11. 模糊查询
SELECT column1, column2, ...
FROM table_name
WHERE column_name LIKE pattern;
12. NULL值处理
SELECT column1, column2, ...
FROM table_name
WHERE column_name IS NULL;
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