色婷婷狠狠18禁久久YY,CHINESE性内射高清国产,国产女人18毛片水真多1,国产AV在线观看

mysql數(shù)據(jù)庫sql語句大全

錢淋西1年前9瀏覽0評論

MySQL是一款非常流行的關(guān)系型數(shù)據(jù)庫管理系統(tǒng),通過SQL語言來操作數(shù)據(jù)庫。下面是MySQL數(shù)據(jù)庫SQL語句大全:

創(chuàng)建表:
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
column3 datatype,
.....
);
刪除表:
DROP TABLE table_name;
插入數(shù)據(jù):
INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);
更新數(shù)據(jù):
UPDATE table_name SET column_name = new_value WHERE column_name = some_value;
刪除數(shù)據(jù):
DELETE FROM table_name WHERE column_name = some_value;
查詢數(shù)據(jù):
SELECT column1, column2, ...FROM table_name WHERE condition;
查詢數(shù)據(jù)并排序:
SELECT column1, column2, ...FROM table_name ORDER BY column_name ASC|DESC;
查詢數(shù)據(jù)并分組:
SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name;
使用函數(shù)查詢數(shù)據(jù):
SELECT AVG(column_name) FROM table_name;
使用子查詢查詢數(shù)據(jù):
SELECT column_name(s) FROM table_name WHERE column_name IN (SELECT column_name FROM table_name WHERE condition);
聯(lián)合查詢:
SELECT column_name(s) FROM table_name1 UNION SELECT column_name(s) FROM table_name2;
JOIN查詢:
SELECT column_name(s) FROM table_name1 JOIN table_name2 ON table_name1.column_name = table_name2.column_name;
查詢數(shù)據(jù)并限制數(shù)量:
SELECT column_name(s) FROM table_name LIMIT num;
查詢數(shù)據(jù)并跳過前幾個數(shù)據(jù):
SELECT column_name(s) FROM table_name OFFSET num;

以上就是MySQL數(shù)據(jù)庫SQL語句大全,其中包含了常用的增、刪、改、查等操作語句。通過這些語句,我們可以很方便地對數(shù)據(jù)庫進(jìn)行管理和操作。