# 切换到指定的数据库useverifyidear; # 指定表增加字段altertableMyTableaddcolumnIfNotExistsadcolumnvarchar(64)default''; # 删除表中字段altertableMyTabledropcolumnIfExistsadcolumn; #增加表注释altertablemytable comment'测试用表'; # 修
从MariaDB 10.0.2开始,ALTER TABLE还支持IF EXISTS和IF NOT EXISTS字句。包括以下几种情况: 1 2 3 4 5 6 7 8 9 10 11 12 13ADDCOLUMN[IFNOTEXISTS]ADDINDEX [IFNOTEXISTS]ADDFOREIGNKEY [IFNOTEXISTS]ADDPARTITION[IFNOTEXISTS]CREATEINDEX [IFNOTEXISTS]DROPCOLUMN[IFEXISTS]DROPINDEX [IFEXISTS]DROPFOREIG...
ADD COLUMN [IF NOT EXISTS] ADD INDEX [IF NOT EXISTS] ADD FOREIGN KEY [IF NOT EXISTS] ADD PARTITION [IF NOT EXISTS] CREATE INDEX [IF NOT EXISTS] DROP COLUMN [IF EXISTS] DROP INDEX [IF EXISTS] DROP FOREIGN KEY [IF EXISTS] DROP PARTITION [IF EXISTS] CHANGE COLUMN [IF EXISTS] MODIFY...
create temporary table if not exists book_table(...); --删除表 drop table bookInfo; --重命名 alter table bookInfo rename [to] book_info; --修改表(列的管理) --添加列 alter table bookInfo add column book_press varchar(20); --column关键字可以省略 alter table bookInfo add book_press varc...
create [temporary] table [if not exists] tbl_name 修改表: alter [online|offline] [ignore] table tbl_name 字段: 添加:add [column] col_name column_definition 删除:drop [column] col_name 修改:change [column] old_col_name new_col_name column_definition ...
MariaDB 10.0.2 supportsIF EXISTSandIF NOT EXISTSoptions for severalALTER TABLEsub-commands. Here’s the list of those clauses (copied from the MariaDB KnowledgeBase): ADD COLUMN ADD INDEX ADD FOREIGN KEY ADD PARTITION DROP COLUMN DROP INDEX ...
列:column 索引:index 视图:view 用户:user 权限:privilege 存储过程:procedure 存储函数:function 触发器:trigger 事件调度器:event scheduler mysql_secure_installation:安全初始化 SQL语句: DDL: Data Defination Language CREATE, DROP, ALTER DML: Data Manipulation Language ...
CREATE TABLE [IF NOT EXISTS] tb1_name(create_defination)[table_options] create_defination: 字段:col_name data_type 键: PRIMARY KEY (col1,col2,…) UNIQUE KEY(col1,col2,…) FOREIGN KEY(column) 索引: KEY|INDEX [index_name] (col1,col2…) ...
create [temporary] table [if not exists] tbl_name 修改表: alter [online|offline] [ignore] table tbl_name 字段: 添加:add [column] col_name column_definition 删除:drop [column] col_name 修改:change [column] old_col_name new_col_name column_definition modify [column] col_name co...
问MariaDB显示自更新10.1至10.5以来的错误，而不是警告EN 昨天，新来不久的同事调试一个准备...