mysql 的sql语句中加COLLATE utf8mb4_general_ci
时间: 2023-08-06 19:04:50 浏览: 293
COLLATE关键词用于在MySQL的SQL语句中指定字符集的排序规则。utf8mb4_general_ci是一种常用的排序规则,适用于存储Unicode字符集的数据。
在SQL语句中,如果需要指定特定的排序规则,可以在相关的字段或表达式后面使用COLLATE关键词来指定。例如,如果你想在一个查询中使用utf8mb4_general_ci排序规则,可以这样写:
SELECT column_name FROM table_name ORDER BY column_name COLLATE utf8mb4_general_ci;
这个语句将按照指定的排序规则对结果进行排序。请注意,utf8mb4_general_ci排序规则是不区分大小写的,这意味着它会将"A"和"a"视为相同的值进行排序。
希望这个回答对你有帮助!如果你还有其他问题,请随时提问。
相关问题
把这段代码改为doris的建表语句CREATE TABLE `aa_ccd` ( `ID` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL, `CCDCODE` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `ICNNAME` varchar(107) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `ISDISEASE` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `ENNAME` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `PARENTID` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `YEAR` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `NOTE` varchar(200) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LEFTSPACE` varchar(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LIMITED` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LEVEL1` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LEVEL2` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LEVEL3` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LEVEL4` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, PRIMARY KEY (`ID`) USING BTREE, INDEX `index1`(`CCDCODE`) USING BTREE, INDEX `index2`(`ICNNAME`) USING BTREE, INDEX `index_yes`(`YEAR`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
您好!以下是将代码改为Doris建表语句的结果:
CREATE TABLE aa_ccd (
ID VARCHAR(20),
CCDCODE VARCHAR(20),
ICNNAME VARCHAR(107),
ISDISEASE VARCHAR(20),
ENNAME VARCHAR(20),
PARENTID VARCHAR(20),
YEAR VARCHAR(4),
NOTE VARCHAR(200),
LEFTSPACE VARCHAR(10),
LIMITED VARCHAR(4),
LEVEL1 VARCHAR(4),
LEVEL2 VARCHAR(4),
LEVEL3 VARCHAR(4),
LEVEL4 VARCHAR(4)
) DISTRIBUTE BY HASH(ID) BUCKETS 8 PROPERTIES("replication_num"="1");
DROP TABLE IF EXISTS `aa_ccd`; CREATE TABLE `aa_ccd` ( `ID` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL, `CCDCODE` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `ICNNAME` varchar(107) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `ISDISEASE` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `ENNAME` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `PARENTID` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `YEAR` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `NOTE` varchar(200) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LEFTSPACE` varchar(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LIMITED` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LEVEL1` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LEVEL2` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LEVEL3` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `LEVEL4` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, PRIMARY KEY (`ID`) USING BTREE, INDEX `index1`(`CCDCODE`) USING BTREE, INDEX `index2`(`ICNNAME`) USING BTREE, INDEX `index_yes`(`YEAR`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; 这个建表sql在doris数据库执行时报错,[SQL] Query doris_2 start [ERR] 1105 - errCode = 2, detailMessage = Syntax error in line 25: `id` varchar(50) CHARACTER SET utf8mb4 COLLAT... ^ Encountered: CHARACTER Expected: COMMA [ERR] 这是为什么
根据报错信息,可以看到是在第25行出现了语法错误,缺少了逗号。具体来说,是因为在第24行的最后缺少了一个逗号,导致第25行的语句被解析为一个新的字段,而不是原本的字段属性。因此,应该在第24行最后加上逗号,即在 `LEVEL4` varchar(4) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL 后面加一个逗号,就可以解决这个问题了。
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