[table_options] [select_statement] TEMPORARY:该关键字表示用MySQL create table新建的表为临时表,此表在当前会话结束后将自动消失。临时表主要被应用于存储过程中,对于目前尚不支持存储过程的MySQL,该关键字一般不用。 IF NOT EXISTS:实际上是在建表前加上一个判断,只有该表目前尚不存在时才执行create table操作。
CREATE[TEMPORARY]TABLE[IFNOTEXISTS] tbl_name [(create_definition,...)] [table_options] [partition_options] [IGNORE|REPLACE] [AS] query_expression 3.简单SQL表明结构: 1 CREATETABLEt7liket1; 格式: 1 CREATE[TEMPORARY]TABLE[IFNOTEXISTS] tbl_name {LIKEold_tbl_name | (LIKEold_tbl_name) } tb...
CREATE TABLE允许使用 SQL数据类型(例如,VARCHAR(24)或CHARACTER VARING(24))或通过直接指定它映射到的数据类型类(例如,%Library.String(MAXLEN=24)或%String(MAXLEN=24))来指定数据类型。(对于所有数据类型类,语法形式%Library.Datatype和%Datatype是同义词。) 通常, SQL(如CREATE TABLE命令)指定数据类型。可以直...
A request from Support: Add the names of the default character set and the default collation to SHOW CREATE TABLE. Currently, for this statement: CREATE TABLE x ( col1 CHAR(5), col2 CHAR(5) CHARACTER SET latin1 COLLATE latin1_swedish_ci); the SHOW CREATE TABLE statement shows the chara...
table_tablegroup指定表所属的 Table Group。 AUTO_INCREMENT指定表中自增列的初始值。 comment注释。 LOCALITY描述副本在 Zone 间的分布情况,如:F@z1、F@z2、F@z3、R@z4表示z1、z2、z3为全功能副本,z4为只读副本。 PCTFREE指定宏块保留空间百分比。
HasColumnType("varchar(512) CHARACTER SET utf8mb4") .HasMaxLength(512); b.Property<string>("UserName") .HasColumnType("varchar(512) CHARACTER SET utf8mb4") .HasMaxLength(512); b.HasKey("Id"); b.HasIndex("EntityId"); b.ToTable("Logs"); }); } Please let me know if this ...
[=] locality_option] table_option: [[STORAGE] ENGINE [=] engine_name] [COMMENT [=] 'string'] [{CHARSET | CHARACTER SET} [=] charset] [COLLATE [=] collation] [TABLEGROUP [=] table_group_id] [LOCALITY [=] locality_option] locality_option: 'dn=storage_inst_id_list' storage_inst_...
Retrained attributes are NULL (or NOT NULL) and, for those columns that have them, CHARACTER SET, COLLATION, COMMENT, and the DEFAULT clause. When creating a table with CREATE TABLE ... SELECT, make sure to alias any function calls or expressions in the query. If you do not, the ...
创建表时,不支持创建基于查询的表:create table as select,会输出空字符串。 table options 支持指定表级别 COMMENT。 支持指定CHARACTER SET。 其它table option 均不支持解析,会被忽略。 table options 的详细定义如下: table_option: { AUTOEXTEND_SIZE [=]value|AUTO_INCREMENT [=]value|AVG_ROW_LENGTH [=]...
As with ON and TEXTIMAGE_ON, the value set by using CREATE TABLE for FILESTREAM_ON cannot be changed, except in the following cases: A . max Applies only to the varchar, nvarchar, and varbinary data types for storing 2^31 bytes of character and binary data, and 2^30 bytes of Unicode...