CREATE TABLE [IF NOT EXISTS] table_name( column_definition1, column_definition2, …….., table_constraints ); 也可简写为: CREATE TABLE table_name (column_name column_type); 上述语法的参数说明如下: 以下例子中我们将在 RUNOON 数据库中创建数据...
TheDEFAULTclause specifies a default value for a column. With one exception, the default value must be a constant; it cannot be a function or an expression. This means, for example, that you cannot set the default for a date column to be the value of a function such asNOW()orCURRENT_...
IF NOT EXISTS. An optional check that prevents an error if a table with the same name already exists. The exact table parameters are not checked and can be identical to another database table. [table_name]. Table name that can also be in the format`[database_name]`.`[table_name]`. ...
LIKE to create an empty table based on the definition of another table, including any column attributes and indexes defined in the original table: CREATE TABLE new_tbl LIKE orig_tbl; For more information, see Section 13.1.18.3, “CREATE TABLE ... LIKE Statement”. [AS] query_expression ...
Limits on MySQL table column count and row size MySQL DESCRIBE statement Various Examples: MySQL CREATE TABLE Syntax: CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name (create_definition,...) [table_options] [partition_options] Or CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name ...
CREATETABLEusers(idINTAUTO_INCREMENTPRIMARYKEY,usernameVARCHAR(50),emailVARCHAR(50)); 1. 2. 3. 4. 5. 接下来,我们可以使用INSERT INTO语句向表格中插入数据。INSERT INTO语句的基本语法如下: INSERTINTOtable_name(column1,column2,column3,...)VALUES(value1,value2,value3,...); ...
NO_ZERO_DATE または NO_ZERO_IN_DATE SQL モードが有効になっているときに、日付の値のデフォルトがそのモードに従って正しくない場合、CREATE TABLE では厳密な SQL モードが有効になっていない場合は警告を、厳密モードが有効になっている場合はエラーを生成します。 たとえば、NO_ZERO...
Date: November 17, 2009 08:26AM There is always a primary key. If you do not define one, it will be created for you. Find the hidden $PK column below $ ndb_desc -d test TABLE -- TABLE -- Version: 1 Fragment type: 9 K Value: 6 ...
MySQL 兼容模式临时表和 Oracle 兼容模式临时表一样,当前 Session 访问临时表之后,后续 SQL 只能发往当前 Session。 临时表数据清理 当Session 断开时会自动将本 Session 创建的临时表 DROP 掉。 已知问题 CREATE TABLE AS SELECT 中有临时表可能存在创建表为空的情况。 上一篇 CREATE SEQUENCE 下一篇 CREATE TABLE...
The MySQL CREATE TABLE StatementThe CREATE TABLE statement is used to create a new table in a database.SyntaxCREATE TABLE table_name ( column1 datatype, column2 datatype, column3 datatype, ... ); The column parameters specify the names of the columns of the table.The...