If NOT EXISTS (INDEX) 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. ...
ifnotindex_exists:# 添加索引query="ALTER TABLE tablename ADD INDEX index_name (column_name)"cursor.execute(query)cnx.commit()print("索引添加成功") 1. 2. 3. 4. 5. 6. 类图 Developer-name: String+addIndex(indexName: String, tableName: String, columnName: String) : void+isIndexExists(i...
这是一个不存在就添加索引的例子,若需求是存在则删除 微调下面的 if not exists 即可 DROP PROCEDURE IF EXISTS add_index; DELIMITER $ CREATE PROCEDURE add_index() BEGIN DECLARE target_database VARCHAR(100); DECLARE target_table_name VARCHAR(100); DECLARE target_column_name VARCHAR(100); DECLARE ta...
通过存储过程判断索引是否存在,不存在则增加: DROPPROCEDUREIFEXISTSpro_AddIndex;DELIMITER;CREATEPROCEDUREpro_AddIndex()BEGINIFNOTEXISTS(SELECT*FROMinformation_schema.statisticsWHEREtable_schema=CurrentDatabaseANDtable_name='rtc_phototype'ANDindex_name='index_name')THENALTERTABLE`rtc_Phototype`ADDINDEXindex_nam...
# 添加索引alter table t1 add index index_name (column_list) ;alter table t1 add unique (column_list) ;alter table t1 add primary key (column_list) ; # 删除索引alter table t1 drop index index_name ;alter table t1 drop primary key ; 6.截断表 截断表即truncate table,也可理解为清空表,...
-- 增加字段 ADD [ COLUMN] 字段名 -- 创建主键 ADD PRIMARY KEY(字段名) -- 创建唯一索引 ADD UNIQUE [索引名](字段名) -- 创建普通索引 ADD INDEX [索引名](字段名) -- 删除字段 DROP [COLUMN] 字段名 -- 支持对字段属性进行修改 MODIFY [COLUMN] 字段名 字段属性 --支持对字段名进行修改 CHANGE...
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ALTER TABLE语法) ALTER TABLE 表名 操作名 -- 操作名 ADD[ COLUMN] 字段定义 -- 增加字段 AFTER 字段名 -- 表示增加在该字段名后面 FIRST -- 表示增加在第一个 ADD PRIMARY KEY(字段名) -- 创建主键 ADD UNIQUE [索引名] (字段名)-- 创建唯一索引 ADD INDEX [索引名] (字段名) -- 创建普通索引...
On the other hand, if we useINSERT IGNORE, the duplication attempt is ignored and no resulting errors occur: mysql> INSERT IGNORE INTO books (id, title, author, year_published) VALUES (1,'Green Eggs and Ham','Dr. Seuss', 1960); Query OK, 0 rows affected (0.00 sec) ...
Re: ADD INDEX to Table if not exists Rick James June 30, 2011 07:38PM Re: ADD INDEX to Table if not exists Jo Wo July 01, 2011 02:16AM Re: ADD INDEX to Table if not exists Jo Wo July 03, 2011 02:05AM Sorry, you can't reply to this topic. It has been closed.Content...