问使用IDENTITY列将记录插入SQL表EN很多时候，都需要对数据表进行历史记录。比如每修改一次表单，之前的表...
<column_set_definition> ::= column_set_name XML COLUMN_SET FOR ALL_SPARSE_COLUMNS <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] ( column_name [ ASC | DESC ] [ ,... n ] ) [ WITH FILLFACTOR = fillfactor | WITH (...
when you insert a new row into the table. The following, create table statement marks PersonId as an identity column with seed = 1 and Identity Increment = 1. Seed and Increment values are optional. If you don't specify the identity and seed they both default to 1...
CREATE [GLOBAL TEMPORARY] TABLE table (table-element-commalist) [shard-key] [WITH table-option-commalist] table-element ::= [%DESCRIPTION string] [%FILE string] [{%EXTENTSIZE | %NUMROWS} integer] [%PUBLICROWID] [%ROUTINE string] { fieldname datatype [AUTO_INCREMENT] | IDENTITY | SERIAL...
USE test; --创建物料清单明细表--- CREATE TABLE tbl_MaterialList ( AutoNum int IDENTITY(1,1) NOT NULL, --自动填充序号 ApproverTag BIT DEFAULT 0 NOT NULL, --是否过审,审批标签 CodePrefix VARCHAR(3) NULL, --编号前缀 Code VARCHAR(10) NOT NULL, --编号 NameEN VARCHAR(30) NOT NULL, --...
< table_constraint > ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] (column [ ASC | DESC ] [ ,...n ] ) [ WITH FILLFACTOR = fillfactor |WITH ( <index_option> [ , ...n ] ) ...
...在Table中创建的Column,如果使用Identity属性标识,那么该列是ID列。默认情况下,不能显式向ID列插入数值。...如果想要显式向ID列插入特定的数值,那么,必须启用 Identity_Insert选项,该选项自动将ID值更新为ID列的最大值。 2.1K00 SqlAlchemy 2.0 中文文档(五十一)...
Create Table 创建表 CREATE [TEMPORARY] [EXTERNAL] TABLE [IF NOT EXISTS] [db_name.]table_name -- (Note: TEMPORARY available in Hive 0.14.0 and later) [(col_name data_type [COMMENT col_comment], ... [constraint_specification])]
CREATETABLEMyTable ( mycolumnnn1nvarchar, mycolumn2nvarcharCOLLATEFrisian_100_CS_AS )WITH( CLUSTERED COLUMNSTOREINDEX) ; B. 指定列的 DEFAULT 约束 以下示例显示了为列指定默认值的语法。colA列具有名为constraint_colA的默认约束,默认值为0。 SQL ...
c.ADD子句:向表中增加新列,新列的定义方法与CREATE TABLE命令中定义列的方法相同。一次可以添加多个列,中间用逗号隔开。 d.DROP子句:从表中删除列或约束。(删除列之前,必须先删除基于该列的所有索引和约束)。 e.WITH子句:[WITH{CHECK|NOCHECK}]指定表中的数据是否用新添加的或重新启用的FOREIGN KEY或CHECK约束...