CREATE TABLE - SQL Command Article 06/18/2008 In this article Parameters Remarks Examples See Also Creates a table using the specified fields or from an array.Copy CREATE TABLE | DBF TableName1 [NAME LongTableName] [FREE] [CODEPAGE = nCodePage] ( FieldName1 FieldType [( n...
Visual FoxPro uses the default value if you use the ALTER TABLE - SQL command to remove autoincrementing for the field. PRIMARY KEY | UNIQUE PRIMARY KEY creates a primary index for the field specified in FieldName1. UNIQUE creates a candidate index for the field specified in FieldName1. ...
CREATE TABLE - SQL Command Article 11/14/2006 Creates a table using the specified fields or from an array. Copy CREATE TABLE | DBF TableName1 [NAME LongTableName] [FREE] ( FieldName1 FieldType [( nFieldWidth [, nPrecision] )] [NULL | NOT NULL] [CHECK lExpression1 [ERROR cMessageTe...
UNIQUE Creates a candidate index for the field. The candidate index tag has the same name as the field.Note Candidate indexes (created by including the UNIQUE option in CREATE TABLE or ALTER TABLE - SQL) are not the same as indexes created with the UNIQUE option in the INDEX command. An...
Here, the SQL command creates a database namedCompanieswith the columns:id,name,address,emailandphone. SQL CREATE TABLE Syntax CREATETABLEtable_name ( column1 datatype, column2 datatype, column3 datatype, ... ); Here, table_nameis name of the table you want to create column...
Tables are created with no data unless a subquery is specified. You can add rows to a table with the INSERT statement. After creating a table, you can define additional columns, partitions, and integrity constraints with the ADD clause of the ALTER TABLE statement. You can change the definiti...
SQL CREATE TABLE | SELECT Statement Syntax Here is the syntax to be used with SQL CREATE TABLE with SELECT statement: sql sql CREATETABLEtable_nameAS(SELECTcolumn1_name, column2_name, column3_name...FROMexist_tableWHEREcondition); [table_name]: name for a table to be created. ...
The CREATE TABLE statement defines a table. The definition must include its name and the names and attributes of its columns. The definition can include other attributes of the table, such as its primary key and its table space.
Making your SQL that tiny bit faster.Whereas with a heap table, the database could store them anywhere.You can extend this principle to any table with a composite PK. And you (almost always) search for rows where the first column of the PK equals some value....
如下所示,对于create table基础建表语句,pg_plan_queries没有经过pg_plan_query函数,而是直接创建PlannedStmt节点,然后将query->utilityStmt设置到PlannedStmt节点的utilityStmt成员。 Portal流程 portal = CreatePortal("", true, true);函数创建PortalData结构体,并初始化其中的部分成员,比如portalCo...