Change column type and settings during table copying

      
mysql>
mysql>
mysql>
mysql> CREATE   TABLE TEAMS
    ->         (TEAMNO         INTEGER      NOT NULL,
    ->          EmployeeNO       INTEGER      NOT NULL,
    ->          DIVISION       CHAR(6)      NOT NULL,
    ->          PRIMARY KEY    (TEAMNO)             );

mysql>
mysql>
mysql> INSERT INTO TEAMS VALUES (1,  6, 'first');

mysql> INSERT INTO TEAMS VALUES (2, 27, 'second');

mysql>
mysql> CREATE TABLE TEAMS_COPY5
    ->       (TEAMNO     INTEGER NOT NULL PRIMARY KEY,
    ->        EmployeeNO   INTEGER NULL,
    ->        DIVISION   CHAR(10) NOT NULL) AS
    -> (SELECT   *
    ->  FROM     TEAMS)
    -> ;
Query OK, 2 rows affected (0.00 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql>
mysql> drop table teams_copy5;
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> CREATE TABLE TEAMS_COPY5
    ->       (EmployeeNO   INTEGER NULL,
    ->        DIVISION   CHAR(10) NOT NULL) AS
    -> (SELECT   *
    ->  FROM     TEAMS);
Query OK, 2 rows affected (0.00 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql>
mysql>
mysql> drop table teams;
Query OK, 0 rows affected (0.00 sec)

mysql> drop table teams_copy5;
Query OK, 0 rows affected (0.00 sec)

Related examples in the same category

1.	Important Column Attributes and Options
2.	Drop a column
3.	Chage column name
4.	Change column definition
5.	Change column data length
6.	Change column data type
7.	change column type and sequence in table
8.	Modify a column
9.	Adding a Column
10.	Changing a Column Definition
11.	Renaming a Table
12.	Dropping a Column
13.	Syntax for Adding a Column
14.	Returns detailed information about all columns of the table tablename
15.	Exchanging Rows and Columns
16.	To copy only some of the columns, name the ones you want in the SELECT part of the statement.
17.	To create columns in a different order than that in which they appear in the source table
18.	Get information only for the co_2 column, you can't use this query:
19.	The -e option specifies the query to execute, and -N tells MySQL not to write the row of column names that normally precedes query output.
20.	Copying Only Selected Columns from a Table
21.	Specifying Which Columns to Display
22.	Giving Names to Output Columns
23.	Aliases can be applied to any result set column, not just those that come from tables
24.	Combining Columns to Construct Composite Values
25.	Put the comparison expression in the output column list, perhaps including the values that you're comparing
26.	Refer to the additional output column by position
27.	Take everything but the rightmost two columns
28.	Dropping, Adding, or Repositioning a Column
29.	To indicate a column at a specific position within the table, either use FIRST to make it the first column, or
30.	Changing a Column Definition or Name
31.	After the CHANGE keyword, you name the column you want to change, then specify the new definition, which inclu
32.	Changing a Column's Default Value
33.	Information only about a single column, use a LIKE clause that matches the column name
34.	-d option specifies a field delimiter of : and the -f option indicates that you want to cut column one and all
35.	Add a sequence column named id to the table
36.	Give each table a short alias and refer to table columns using the aliases:
37.	To exclude them, provide a column output list that names specifically only those columns
38.	To produce additional columns showing the total and average values of the books for each author in the author
39.	CREATE TABLE statement provides an example of a TEXT column named DescriptionDoc
40.	Create the Catalog table and includes two NOT NULL columns
41.	Reference a column
42.	Add and drop columns
43.	Giving Columns a New Heading with AS
44.	Alias column with spaces
45.	Insert data without column names
46.	Column definition with modifiers
47.	Sort by column name
48.	Sort more than one columns
49.	Get the descriptive data of the columns belonging to the PLAYERS table
50.	A table contains only one column.
51.	A column definition may include options to define the column data more precisely.
52.	More complex tables have multiple columns
53.	Adding and Dropping Columns
54.	Modifying Existing Columns
55.	Change the LastName column from CHAR(30) to CHAR(40) without renaming the column
56.	Column Types
57.	NULL Values and Column Definitions
58.	Use single quote with char type column
59.	Column alias with underscore
60.	Using Case clause to show meaningful value for column
61.	Select all columns from a table inside another database
62.	Concatenate columns
63.	Using qulified column name
64.	Compare two columns together
65.	Compare two columns and yield two values
66.	Column sequence in insert statemenet
67.	Enlarge column during table copying
68.	Set column to use default value
69.	Get default value from a column
70.	Table column with comments
71.	Check table column settings
72.	Unique modifier for column definition
73.	Indicate unique after column definition
74.	Check column value
75.	Set type column
76.	To disallow NULL values in any of the columns, add NOT NULL to the definition of each one.

Change column type and settings during table copying : Column « Table Index « SQL / MySQL

Related examples in the same category