I am using DB2-UDB (no mainframe) Upvote 0 Downvote Jul 29, 2003 #4 fahmy80 Programmer Jul 23, 2003 3 IN Consider the following values for the table fields : secondary_field1 char 4 = '1234' ==> primary key secondary_field2 char 4 = '5678' ==> primary key secondary_field3...
mysql新建表指定primarykey 并且自增 mysql创建表自增,当我们对MySQL进行分表操作后,将不能依赖MySQL的自动增量来产生唯一ID了,因为数据已经分散到多个表中。应尽量避免使用自增IP来做为主键,为数据库分表操作带来极大的不便。在postgreSQL、oracle、db2数据库中有一个
Primary Key:- Primary Key is an attribute or a set of attributes in a table which uniquely identifies a record (row) in a table and no two records (rows) in the table can have the same values for all the columns comprising the primary key. Unique Key:- A unique key is a key whi...
Sql_mode值 DB2 PIPES_AS_CONCAT、ANSI_QUOTES、IGNORE_SPACE、NO_KEY_OPTIONS、NO_TABLE_OPTIONS、NO_FIELD_OPTIONS MAXDB PIPES_AS_CONCAT、ANSI_QUOTES、IGNORE_SPACE、NO_KEY_OPTIONS、NO_TABLE_OPTIONS、NO_FIELD_OPTIONS、 NO_AUTO_CREATE_USER MSSQL PIPES_AS_CONCAT、ANSI_QUOTES、IGNORE_SPACE、NO_KEY_OP...
classMembership<ActiveRecord::Baseself.primary_keys=:user_id,:group_idbelongs_to:userbelongs_to:grouphas_many:statuses,:class_name=>'MembershipStatus',:foreign_key=>[:user_id,:group_id]end Note the addition of the line: self.primary_keys=:user_id,:group_id ...
5 KEY_SEQSMALLINT not NULLColumn sequence number in the primary key, starting with 1. 6 PK_NAMEVARCHAR(128)Primary key identifier. NULL if not applicable to the data source. Note:The column names used byDB2 for iCLI follow the X/Open CLI CAE specification style. The column types, conten...
Type an asterisk in Creator ID and the desired table name or use DB2 LIKE syntax in Table Name. Press ENTER to display the Define Optim Primary Key panel, overlaid with a pop-up, prompting for a Creator ID, as shown in the following figure. Figure 1. Specify Creator ID for Base ...
information_schema.TABLE_CONSTRAINTS tc ON t.table_schema = tc.table_schema AND t.table_name = tc.table_name AND tc.constraint_type = 'PRIMARY KEY' WHERE tc.constraint_name IS NULL AND t.table_type = 'BASE TABLE' AND t.table_schema not in ('information_schema','mysql','performance_...
Create a database named db2, create a table named store_sales in the database, and then add a foreign key column named ss_item_sk. CREATE DATABASE db2; USE db2; CREATE TABLE store_sales ( ss_sale_id bigint, ss_store_sk bigint, ss_item_sk bigint not null, CONSTRAINT fk_cons...
@@FETCH_STATUS in nested loops @@ServerName returns wrong value in SQL SERVER 2008 ##TempTable and INSERT-SELECT FROM an existing Table with an IDENTITY column %rowtype equivalent in SQL server ++ operator in TSQL - bug or feature? 2 tables referencing each other using foreign key.is it ...