ALTER TABLE ADD INDEX END IF; I also found out that i can "filter" the SHOW INDEXES Result through a WHERE like: SHOW INDEXES FROM TABLE WHERE Key_Name = "KEYNAME"; So I get a NULL result or a single Line result. But now I don´t know how to "include" that knowledge into so...
---TABLE_SCHEMA 库名;TABLE 表名 ---AND UPPER(INDEX_NAME) != 'PRIMARY' 只查询索引,不需要主键 SELECTCONCAT('ALTER TABLE `',TABLE_NAME,'` ', 'ADD ', IF(NON_UNIQUE = 1, CASE UPPER(INDEX_TYPE) WHEN 'FULLTEXT' THEN 'FULLTEXT INDEX' WHEN 'SPATIAL' THEN 'SPATIAL INDEX' ELSE CONCA...
(1) SQL如果创建时候,不指定类型那么默认是非聚集索引 (2) 聚集索引和非聚集索引都可以有重复记录,唯一索引不能有重复记录。 (3) 主键 默认是加了唯一约束的聚集索引,但是也可以在主键创建时,指定为唯一约束的非聚集索引,因此主键仅仅是默认加了唯一约束的聚集索引,不能说主键就是加了唯一约束的聚集索引 有点拗...
---TABLE_SCHEMA 库名;TABLE 表名 ---AND UPPER(INDEX_NAME) != 'PRIMARY' 只查询索引,不需要主键 SELECTCONCAT('ALTER TABLE `',TABLE_NAME,'` ', 'ADD ', IF(NON_UNIQUE = 1, CASE UPPER(INDEX_TYPE) WHEN 'FULLTEXT' THEN 'FULLTEXT INDEX' WHEN 'SPATIAL' THEN 'SPATIAL INDEX' ELSE CONCA...
alter table `config` add index idx_config_name(`name`); 1. * 删除索引 alter table `config` drop index idx_config_name; 1. * explain 查看是否使用到了索引 insert into config(name, value, info) values('SMS_ENABLED', '0', '0表示禁用发短信功能, 1表示启用发短信功能'); ...
ALTER TABLE t1 ADD INDEX ((col1 * 40)); Terminology Key part: An index/key consists of one or more key parts. For instance, "CREATE INDEX idx1 ON t1 (col1, col2);" creates one index with two key parts. The key part is a reference to a column in the table, and for STRING/...
the 5.1 mysql_alter_table() is out of the question, then InnoDB Plugin could return a (highly counterintuitive) error for the alter table t drop index b, add index b(b); saying that creating index b would have a duplicate name, even though the user did request to DROP INDEX first.[...
Add support for syntax: [table_name].[column_name] when running in sql_mode=MSSQL or SQL_MODE_QUOTE_WITH_BRACKETS This is needed to make it easy to port sql code from Microsoft SQL server to MySQL. In other words, there will be three ways to delimit identifiers: `with backticks` "...
You can see the recommended changes in the routines below. I have tested this change and after applying it ALTER TABLE ADD INDEX works the same irrespective of whether the character set is Latin-1 or UTF-8. uint Field_str::is_equal(Create_field *new_field) { if (compare_str_field_...
http://stackoverflow.com/questions/18522730/mysql-cluster-error-1296-hy000-got-error-157-unknown-error-code-from-ndbclu Regards Subject Views Written By Posted Add index for mysql table with ndbcluster storage engine 1937 urgen sherpa May 28, 2016 10:54PM ...