解析 D 正确答案:D 解析:选项A)是创建一个新的对象,例如一个表;选项B)用来向表中追加记录,它是非SQL命令;在SQL的ALTER TABLE语句中,可以使用ADD[COLUMN]短语来增加一个新的字段。其中,COLUMN短语表示“列”,可以省略。 知识模块:关系数据库标准语言SQL...
As a result, when we specify a table, we include the column headers and the type of data for each column. We may also decide to place certain limitations, or constraints, to guarantee that the data stored in the table makes sense.The SQL syntax for CREATE TABLE is...
table_nameis name of the table you want to create columnis the name of a column in the table datatypeis the type of data that the column can hold (e.g., integer, varchar, date) Example: SQL CREATE TABLE -- create a table Students with different columnsCREATETABLEStudents(idint,nameva...
CREATETABLEnew_table_nameAS SELECTcolumn1, column2,... FROMexisting_table_name WHERE...; The following SQL creates a new table called "TestTable" (which is a copy of the "Customers" table): Example CREATETABLETestTableAS SELECTcustomername, contactname FROM...
1. mysql> CREATE TABLE tv1 2. > SELECT * FROM (VALUES ROW(1,3,5), ROW(2,4,6)) AS v; 3. mysql> TABLE tv1; 4. +---+---+---+ 5. | column_0 | column_1 | column_2 | 6. +---+---+---+ 7. | 1 | 3 | 5 | 8. | 2 | 4 | 6 | 9. +---+...
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) } ...
SQL SELECT INTO 语法 您可以把所有的列插入新表: SELECT * INTO new_table_name [IN externaldatabase] FROM old_tablename 或者只把希望的列插入新表: SELECT column_name(s) INTO new_table_name [IN externaldatabase] FROM old_tablename SQL SELECT INTO 实例 - 制作备份复件 ...
在SQL Server 2008 R2 中创建新表。 Transact-SQL 语法约定语法 复制 CREATE TABLE [ database_name . [ schema_name ] . | schema_name . ] table_name ( { <column_definition> | <computed_column_definition> | <column_set_definition> | [ <table_constraint> ] [ ,...n ] } ) [ ON {...
[table_options] [partition_options] [IGNORE | REPLACE] [AS] query_expression CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name { LIKE old_tbl_name | (LIKE old_tbl_name) } create_definition: { col_name column_definition | {INDEX | KEY} [index_name] [index_type] (key_part,...) ...
When you create a new table in MySQL, you must specify a type of data for each column. It’s required for SQL to determine how to cooperate with stored data. MySQL supports such categories of data types: String Numeric Date and time ...