CREATEtable_name(column_name data_type,...CONSTRAINTfk_tbl1_tbl2FOREIGNKEY(this_tables_column)REFERENCESother_table_name(other_column_name)); You need to start with the word CONSTRAINT, then the name of the foreign key. The name needs to be unique across the database, so I like to start...
記憶體優化 CREATE TABLE 語法: syntaxsql 複製 CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } ( { <column_definition> | [ <table_constraint> ] [ ,... n ] | [ <table_index> ] [ ,... n ] } [ PERIOD ...
Simple CREATE TABLE syntax (common if not using options): syntaxsql Copy CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } ( { <column_definition> } [ ,... n ] ) [ ; ] Full syntax Disk-based CREATE TABLE syntax: syntaxsql Copy CREATE...
-- create a table named Companies with different columnsCREATETABLECompanies (idint,namevarchar(50), addresstext, emailvarchar(50), phonevarchar(10) ); Here, the SQL command creates a database namedCompanieswith the columns:id,name,address,emailandphone. SQL CREATE TABLE Syntax CREATETABLEtable_...
In the code block below, we have the basic syntax for creating a table with 3 columns: CREATE TABLE TableName( columnName1 TYPE, columnName2 TYPE, columnName3 TYPE ); GO Here is a simple break-down of the syntax: The “CREATE TABLE” command does just what it says, it creates a ...
How to create a global and local temporary table How to create a table with constraints How to create a table in a different filegroup How to create a system-version temporal table The CREATE TABLE statement is used to create a new table in a database. The syntax of CREATE TABLE statement...
Syntax CREATETABLEtable_name( column1 datatype, column2 datatype, column3 datatype, ... ); The column parameters specify the names of the columns of the table. The datatype parameter specifies the type of data the column can hold (e.g. varchar, integer, date, etc.). Tip...
Syntax DATE_FORMAT (date, format) SQL Date Format Functions In SQL, when working with a database, the format of the date in the table must be similar to the input date. There are some default “date format” functions present in SQL. Following are some of the: NOW () – Returns th...
createtableDepartment-( --创建部门编号;int代表整数类型;primary key代表主键;identity(1,1)代表从1开始步长为1自增长; DepartmentIdintprimarykeyidentity(1,1), --创建部门名称;nvarchar(50)代表长度50的字符串;not null代表不能为空; DepartmentName nvarchar(50)notnull, ...
1、DATEADD(datepart,number,date) 作用:返回给指定日期加一个时间间隔后新的datetime值 参数说明: datepart:指定为日期的哪部分增加数值。 常用的值有:年(yy/yyyy),季度(qq/q),月份(mm/m),日(day/dd/d),周(wk/ww),小时(hh),分钟(mi,n),秒(ss/s)。