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------ 官方文档是英文的,看不明白可以参看ocracle的同类函数说明.很多都是一样的.
指定更新的条数
UPDATE a_tbl5 SET name='yyy', phone='999-9999' WHERE name IS NULL LIMIT 3;
CREATE TABLE t (i INT,d INT);
触发器
CREATE TRIGGER trigger1 BEFORE UPDATE ON t IF new.i < 10 EXECUTE PRINT 'trigger1 executed';
CREATE TRIGGER trigger2 BEFORE UPDATE ON t IF new.i > 10 EXECUTE PRINT 'trigger2 executed';
INSERT INTO t VALUES (15,1),(8,0),(11,2),(16,1), (6,0),(1311,3),(3,0);
UPDATE t SET i = i + 1 WHERE 1 = 1;
TRUNCATE TABLE t;//清空数据还是用它吧
INSERT INTO t VALUES (15,1),(8,0),(11,2),(16,1), (6,0),(1311,3),(3,0);
UPDATE t SET i = i + 1 WHERE 1 = 1 ORDER BY i;
下面的例子演示更新多个表
CREATE TABLE a_tbl(id INT PRIMARY KEY, charge DOUBLE);
CREATE TABLE b_tbl(rate_id INT, rate DOUBLE);
INSERT INTO a_tbl VALUES (1, 100.0), (2, 1000.0), (3, 10000.0);
INSERT INTO b_tbl VALUES (1, 0.1), (2, 0.0), (3, 0.2), (3, 0.5);
UPDATE
a_tbl INNER JOIN b_tbl ON a_tbl.id=b_tbl.rate_id
SET
a_tbl.charge = a_tbl.charge * (1 + b_tbl.rate)
WHERE a_tbl.charge > 900.0;