mysql模糊查询之索引优化

三表连查之模糊查询索引优化

注：具体用法10和11步骤。

1、t_project表

DROP TABLE IF EXISTS `t_project`;
CREATE TABLE `t_project`  (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '??Ŀ???',`remark` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '??Ŀ?',`money` bigint(11) NULL DEFAULT NULL COMMENT '???ʽ',`day` int(11) NULL DEFAULT NULL COMMENT '????????',`status` char(1) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '0 - ??????ʼ?? 1 - ?ڳ??У? 2 - ?ڳ??ɹ??? 3 - ?ڳ?ʧ?',`deploydate` char(19) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '项目发布日期，天数从发布日期开始到截止日期为项目众筹周期',`supportmoney` bigint(11) NULL DEFAULT 0 COMMENT '֧?ֽ',`supporter` int(11) NULL DEFAULT 0 COMMENT '֧????????',`completion` int(3) NULL DEFAULT 0 COMMENT '???ɶ',`memberid` int(11) NULL DEFAULT NULL COMMENT '??????ID',`createdate` char(19) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '???????',`follower` int(11) NULL DEFAULT 0 COMMENT '??ע??????',`selfintroduction` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '自我介绍',`detaileselfintroduction` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '详细自我介绍',`phone` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '手机号',`servicephone` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '客服电话',PRIMARY KEY (`id`) USING BTREE,INDEX `idx_createdata`(`createdate`) USING BTREE,INDEX `t_project_memberid`(`memberid`) USING BTREE,INDEX `t_project_memberid_createdate`(`memberid`, `createdate`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 17 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '??Ŀ?' ROW_FORMAT = Dynamic;

2、t_project表数据

INSERT INTO `t_project` VALUES (1, '智能高清监控机器人', '可爱的造型，摄像安防远程互联的全能设计，让你随时随地守护您的家人，陪伴你的生活。', 300000, 30, '5', '2019-11-20 11:49:32', 118239, 0, 39, 4, '2019-11-20 11:49:32', 1, '兴旺发达8888', '天合兴成立于2009年,已发展成为各种型材及其他金属材料的深加工，及成品组装于一体的综合型公司', '17358335744', '15186421194');
INSERT INTO `t_project` VALUES (2, 'NEOKA智能手环', '要运动更要安全，这款、名为“蝶舞”的NEOKA-V9100智能运动手环为“安全运动而生”。', 300000, 30, '7', '2019-11-20 11:49:32', 17462, 0, 6, 4, '2019-11-20 11:49:32', 2, '松鼠传媒精选', '松鼠传媒致力于建设优势品牌，并使之传承百世。在日益碎片化和愈加喧闹的数字化世界中，让品牌有所作为。', '15186421194', '15186421194');
INSERT INTO `t_project` VALUES (3, '驱蚊扣', '随处使用的驱蚊纽扣，\r\n解决夏季蚊虫问题。', 300000, 30, '6', '2019-11-20 11:49:32', 154429, 1, 51, 4, '2019-11-20 11:49:32', 1, '梵昕诺男衬衫', '晓亿服饰科技发展有限公司，是一家致力于将意大利精致精奢制衣理念引进国内市场的公司。', '15186421194', '15186421194');
INSERT INTO `t_project` VALUES (8, '智能机器猫', '智能机器猫，课外阅读，英文翻译，聊天，样样精通', 500000, 60, '1', '2019-12-13 16:10:06', 0, 0, 0, 4, '2019-12-13 16:10:06', 1, '徐涛', '贵州省兴仁市东湖社区', '13243526567', '15186421194');
INSERT INTO `t_project` VALUES (9, '量橙未来科技蓄能控温时尚卫衣', '量橙未来科技蓄能控温时尚卫衣量橙未来科技蓄能控温时尚卫衣量橙未来科技蓄能控温时尚卫衣量橙未来科技蓄能控温时尚卫衣量橙未来科技蓄能控温时尚卫衣', 1000000, 60, '1', '2019-12-13 16:44:52', 0, 0, 0, 4, '2019-12-13 16:44:52', 1, '徐涛', '量橙未来科技蓄能控温时尚卫衣量橙未来科技蓄能控温时尚卫衣量橙未来科技蓄能控温时尚卫衣', '15186421194', '15186421194');
INSERT INTO `t_project` VALUES (10, '数传HDR智能4K航拍无人机', '数传HDR智能4K航拍无人机数传HDR智能4K航拍无人机数传HDR智能4K航拍无人机数传HDR智能4K航拍无人机', 500000, 30, '1', '2019-12-13 17:23:15', 0, 0, 0, 4, '2019-12-13 17:23:15', 1, '徐涛', '数传HDR智能4K航拍无人机数传HDR智能4K航拍无人机数传HDR智能4K航拍无人机', '13243526567', '15186421194');
INSERT INTO `t_project` VALUES (11, 'Twinwash柜式洗衣机', 'Twinwash柜式洗衣机Twinwash柜式洗衣机Twinwash柜式洗衣机', 50000, 20, '1', '2019-12-13 20:01:36', 0, 0, 0, 1, '2019-12-13 20:01:36', 1, '李有才', 'Twinwash柜式洗衣机，洗衣服很干净', '17358335744', '15186421194');
INSERT INTO `t_project` VALUES (12, 'LIMOSHAKE未来主食', 'LIMOSHAKE未来主食,论吃饭的重要性', 50000, 20, '1', '2019-12-13 20:11:15', 0, 0, 0, 1, '2019-12-13 20:11:15', 1, '张三', '秦国战士', '17358335744', '15186421194');
INSERT INTO `t_project` VALUES (13, '暴雨级防泼水商务羽绒服', '暴雨级防泼水商务羽绒服，', 50000, 20, '1', '2019-12-13 20:22:33', 0, 0, 0, 1, '2019-12-13 20:22:33', 1, '朝天椒科技', '为运动者提供价格厚道的核心运动户外装备', '13243526567', '15186421194');
INSERT INTO `t_project` VALUES (14, '名童智能电动滑板车', '名童智能电动滑板车，滑板车，小孩的最爱', 100000, 20, '1', '2019-12-13 20:27:39', 32490, 0, 32, 1, '2019-12-13 20:27:39', 2, '兴旺发达8888', '天合兴成立于2009年,已发展成为各种型材及其他金属材料的深加工，及成品组装于一体的综合型公司', '17358335744', '15186421194');
INSERT INTO `t_project` VALUES (15, '屈原瑶浆白酒 有年味的白酒', '屈原瑶浆白酒 有年味的白酒屈原瑶浆白酒 有年味的白酒屈原瑶浆白酒 有年味的白酒', 1000000, 20, '1', '2019-12-16 19:18:59', 28896, 0, 3, 4, '2019-12-16 19:18:59', 3, '松鼠传媒精选', '松鼠传媒致力于建设优势品牌，并使之传承百世。在日益碎片化和愈加喧闹的数字化世界中，让品牌有所作为。', '15186421194', '15186421194');
INSERT INTO `t_project` VALUES (16, '梵昕诺白衬衫 男人的商务铠甲', '梵昕诺白衬衫 男人的商务铠甲梵昕诺白衬衫 男人的商务铠甲梵昕诺白衬衫 男人的商务铠甲', 500000, 30, '1', '2019-12-16 19:52:56', 10686, 0, 2, 4, '2019-12-16 19:52:56', 3, '梵昕诺男衬衫', '晓亿服饰科技发展有限公司，是一家致力于将意大利精致精奢制衣理念引进国内市场的公司。', '15186421194', '15186421194');

3、t_member表

DROP TABLE IF EXISTS `t_member`;
CREATE TABLE `t_member`  (`id` int(11) NOT NULL AUTO_INCREMENT,`loginacct` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '登录账号',`userpswd` char(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '登录密码',`username` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '用户名称',`email` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '电子邮箱',`authstatus` char(1) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '0' COMMENT '实名认证状态 0 - 未实名认证， 1 - 实名认证申请中， 2 - 已实名认证',`usertype` char(1) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT ' 用户类型: 0 - 个人， 1 - 企业',`realname` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '真实名称',`cardnum` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '身份证号码',`accttype` char(1) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '账户类型: 0 - 企业， 1 - 个体， 2 - 个人， 3 - 政府',`phone` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '手机号',PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 7 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '??Ա?' ROW_FORMAT = Dynamic;

4、t_member表数据

INSERT INTO `t_member` VALUES (1, '1518xxx1194', '$2a$10$ScF5ugmmMONNWxiEiYAiGOKak6VVIJjyjQFQY/rhCu.VCZLgLEZ72', '15186xx21194', 'xutao@139.com', '1', '1', '李四', '52231119xx14159', '0', '151xxxxx194');
INSERT INTO `t_member` VALUES (2, '1324xx26560', '$2a$10$bQJYTF7A1.0NWtk1yGaY3.xzDQPzxoxpnrTvaT522U31RNyXYnlUG', '13243xx6567', '71xxxx76@qq.com', '0', '0', NULL, NULL, NULL, '1324xxx6560');
INSERT INTO `t_member` VALUES (3, 'xiuxiu', '$2a$10$Rbr3gX.jboYK0inH3NRpyecjC7y0jBoaHtOsf5VzxLgzwUXFb76y6', '秀秀', '7172xx076@qq.com', '0', '1', NULL, NULL, NULL, '1324xx6561');
INSERT INTO `t_member` VALUES (4, 'zhaxxan', '$2a$10$oNyB7gfAkj5FMDlHW2XezuycCnsR1tKkOADrL1jqz3KehY0pMDefi', '张三', 'zhangsan@zuxia.com', '1', '1', 'xxx', '522xxxx99808120419', '2', '132xxx567');
INSERT INTO `t_member` VALUES (5, 'cexxxchang', '$2a$10$kzGdcTU0KN8Y.I12lcb/QOwyNi66tVKriXAD9PyEDnp1MRV1Xwma6', 'xxx', '157xx877021@163.com', '1', '1', '岑xxx', '522322xxxxx52549', '0', '157xxxxxx021');
INSERT INTO `t_member` VALUES (6, 'xxxx', '$2a$10$qpg4vKMXDiNc7IS2zvHXZOSwZ5iw4lbUcDPpKM02r7zaIn1ze5DuG', '李xx', '18xx848@163.com', '1', '1', 'xx', '5223xxxx0476', '2', '18xxx9848');

5、t_project_images表

DROP TABLE IF EXISTS `t_project_images`;
CREATE TABLE `t_project_images`  (`id` int(11) NOT NULL AUTO_INCREMENT,`projectid` int(11) NULL DEFAULT NULL,`imgurl` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,`imgtype` tinyint(4) NULL DEFAULT NULL COMMENT '0-头部图片 1-详情图片',PRIMARY KEY (`id`) USING BTREE,INDEX `idx_projectid`(`projectid`) USING BTREE,INDEX `idx_imgtype`(`imgtype`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 48 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

6、t_project_images表数据

INSERT INTO `t_project_images` VALUES (1, 1, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/p1.jpg', 0);
INSERT INTO `t_project_images` VALUES (2, 1, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/carousel-1.jpg', 1);
INSERT INTO `t_project_images` VALUES (3, 2, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/p2.jpg', 0);
INSERT INTO `t_project_images` VALUES (4, 2, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/product_detail_head.jpg', 1);
INSERT INTO `t_project_images` VALUES (5, 3, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/p3.png?x-oss-process=style/xutao', 0);
INSERT INTO `t_project_images` VALUES (6, 3, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/p3.jpg', 1);
INSERT INTO `t_project_images` VALUES (7, 1, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/product_detail_body.jpg?x-oss-process=style/xutao', 1);
INSERT INTO `t_project_images` VALUES (14, 8, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/c7dc6d29a2654f8e8c47ce5a0e79fcfe_carousel-1.jpg', 0);
INSERT INTO `t_project_images` VALUES (15, 8, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/ae443faf30274cd3bad317551d8fe8ea_carousel-3.jpg', 1);
INSERT INTO `t_project_images` VALUES (16, 9, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/75a8f71378b54e21a9e1b219982517cb_43eb993804d83095.jpg', 0);
INSERT INTO `t_project_images` VALUES (17, 9, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/6013eda7022c4a1c9ad3a01485744ebd_9f2a774c1f8b2080.jpg', 1);
INSERT INTO `t_project_images` VALUES (18, 9, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/7847dac2439d4bf5b855265942cd8151_d42dd21dc57bf27a.jpg', 1);
INSERT INTO `t_project_images` VALUES (19, 9, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/294234d0c0e14c57b9015ac982c36bc3_d0688a132322f3b0.jpg', 1);
INSERT INTO `t_project_images` VALUES (20, 9, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/a11236309cc84c78853f36856e5e0a18_b2fb81d74d9382c0.jpg', 1);
INSERT INTO `t_project_images` VALUES (21, 9, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/8dec4ea6e7c84b3a990e3c8bce3d5cfb_7dd2c677c5aa459f.jpg', 1);
INSERT INTO `t_project_images` VALUES (22, 9, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/08b7ae58b0f147e19230ec1c337a8179_8b39f0c7a87c1737.jpg', 1);
INSERT INTO `t_project_images` VALUES (23, 9, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/d6a740e826df4a15bb9a85cfa16e45cc_074ef8e38815b819.jpg', 1);
INSERT INTO `t_project_images` VALUES (24, 10, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/4ae42631172540d5b76e020c337840d0_787722ce72235e42.jpg', 0);
INSERT INTO `t_project_images` VALUES (25, 10, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/b818af981d524fd2b0d10d8be286e37b_613ad1979f21b777.jpg', 1);
INSERT INTO `t_project_images` VALUES (26, 10, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/078d902769874da09d72a7992a85472b_a8a50a66f824e3ec.jpg', 1);
INSERT INTO `t_project_images` VALUES (27, 10, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/af48518179254bde83c4c70743273a10_a985766082e474b2.jpg', 1);
INSERT INTO `t_project_images` VALUES (28, 11, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/e24f2dff8bcb44b0bf7cab7aa485ee87_9df1e37b4c7a5d49.jpg', 0);
INSERT INTO `t_project_images` VALUES (29, 11, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/786f9bc4f33a4c56aca8b55b68621984_b40aff6df02edf5d.jpg', 1);
INSERT INTO `t_project_images` VALUES (30, 11, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/e400cb59fe594a1ea84fbac419211d7a_db829f6f6164d0a2.jpg', 1);
INSERT INTO `t_project_images` VALUES (31, 12, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/cf367595edfd40ffb564a374888a42ad_64010c5cdd80bc02.jpg', 0);
INSERT INTO `t_project_images` VALUES (32, 12, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/ba4b4a0a34aa4b308ca05736df3a2f26_0a78ca51e331edf0.jpg', 1);
INSERT INTO `t_project_images` VALUES (33, 12, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/705e9c17fb4c41e9b4124ab1d3c659d3_e92be5df73a4db7f.jpg', 1);
INSERT INTO `t_project_images` VALUES (34, 13, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/5c66c45eaa564d72bd20513f22e91c71_e92be5df73a4db7f.jpg', 0);
INSERT INTO `t_project_images` VALUES (35, 13, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/9fe1ada929f94f25be5cae2a6fdb1d03_93ff383039c9dfef.jpg', 1);
INSERT INTO `t_project_images` VALUES (36, 13, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/9a438f596e3048e48fbeb9ada07f4e5f_cd26b3a2b7c2447e.jpg', 1);
INSERT INTO `t_project_images` VALUES (37, 14, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/a6cfb5b00a354e83a872c8918a56ffbc_47d9c5f4fbff5801.jpg', 0);
INSERT INTO `t_project_images` VALUES (38, 14, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/d2db2fa8c56d430fb9cd6adc31782d95_1073eb09ede35068.jpg', 1);
INSERT INTO `t_project_images` VALUES (39, 14, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/13569c125d9649f796591f79b649f8c0_2268df9190ea04f0.jpg', 1);
INSERT INTO `t_project_images` VALUES (40, 15, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/d1dc791dd7b84e759116489d90b79fdd_0448ce3d567b8ab8.jpg', 0);
INSERT INTO `t_project_images` VALUES (41, 15, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/b5db1855a34d40399e40f78697e9cd25_8b910d68f03c1edd.jpg', 1);
INSERT INTO `t_project_images` VALUES (42, 15, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/f1ffb18fa9654df7ac3ee56dac6366ad_d649ee93b1c6578a (1).jpg', 1);
INSERT INTO `t_project_images` VALUES (43, 15, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/741d1d7172304e7b829dff1e03e20753_d649ee93b1c6578a.jpg', 1);
INSERT INTO `t_project_images` VALUES (44, 16, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/621981d5d9704edb8a4c9e0d1ea5d511_14720fbb2dddd1a4.jpg', 0);
INSERT INTO `t_project_images` VALUES (45, 16, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/b099123a5f1f4e22b6fbaee6bdea5101_309ec58f5cd17793.jpg', 1);
INSERT INTO `t_project_images` VALUES (46, 16, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/e80ba64646714cf4b8429eb702357b7e_77e515358ecbdb4b.jpg', 1);
INSERT INTO `t_project_images` VALUES (47, 16, 'https://xutao666.oss-cn-chengdu.aliyuncs.com/pic/f48f65d924114453a0faf04c1fc70db3_18f1dae5deebb7b3.jpg', 1);

7、没有索引前原始的模糊查询

我们在做模糊查询的时候，简单的优化是 ‘高清%’，有时间并非要想查询的关键词都在开头，所以如果不是特别的要求，’%高清%‘并不合适所有的模糊查询。遇到’%高清%'就的换方法了。

查询sql

EXPLAIN  SELECTa.id,a.name,a.remark,a.money,a.day,a.status,a.createdate,a.memberid,b.imgurl,c.realname
FROM(t_project a LEFT JOIN  t_member c ON a.memberid = c.id)LEFT JOIN t_project_images b ON a.id = b.projectid WHERE b.imgtype = 0  and a.name LIKE '%高清%'

执行结果，

8、给t_project_images表添加索引

create index idx_projectid on t_project_images(projectid)

查询sql

EXPLAIN  SELECTa.id,a.name,a.remark,a.money,a.day,a.status,a.createdate,a.memberid,b.imgurl,c.realname
FROM(t_project a LEFT JOIN  t_member c ON a.memberid = c.id)LEFT JOIN t_project_images b ON a.id = b.projectid WHERE b.imgtype = 0  and a.name LIKE '%高清%'

执行结果

9、创建多个索引

#项目图片表
create index idx_imgtype on t_project_images(imgtype)#项目表
CREATE index t_project_memberid on t_project(memberid)CREATE index t_project_memberid_createdate on t_project(memberid,createdate)CREATE index idx_name on t_project(name)

结果还是一样。

10、采用 LOCATE(‘蚊’, a.name)>0方法

索引同上。

EXPLAIN  SELECTa.id,a.name,a.remark,a.money,a.day,a.status,a.createdate,a.memberid,b.imgurl,c.realname
FROM(t_project a LEFT JOIN  t_member c ON a.memberid = c.id)LEFT JOIN t_project_images b ON a.id = b.projectid WHERE b.imgtype = 0 and  LOCATE('蚊', a.name)>0

结果

都解决了。

11、使用 POSITION(‘蚊’ IN a.name) 方法

索引同上

EXPLAIN  SELECTa.id,a.name,a.remark,a.money,a.day,a.status,a.createdate,a.memberid,b.imgurl,c.realnameFROM(t_project a LEFT JOIN  t_member c ON a.memberid = c.id)LEFT JOIN t_project_images b ON a.id = b.projectid WHERE b.imgtype = 0 and POSITION('蚊' IN a.name)

结果同上一样

问题也能解决。

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mysql模糊查询之索引优化

mysql模糊查询之索引优化

三表连查之模糊查询索引优化

1、t_project表

2、t_project表数据

3、t_member表

4、t_member表数据

5、t_project_images表

6、t_project_images表数据

7、没有索引前原始的模糊查询

8、给t_project_images表添加索引

9、创建多个索引

10、采用 LOCATE(‘蚊’, a.name)>0方法

11、使用 POSITION(‘蚊’ IN a.name) 方法

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