Solution Guide for Migrating Oracle on UNIX to SQL Server - Willy .Net

<strong>Solution</strong> <strong>Guide</strong> <strong>for</strong> <strong>Migrating</strong> <strong>Oracle</strong> on UNIX to SQL Server on Windows 113CREATE TABLE NOT NULL CONSTRAINTS(constraint_name varchar2(30),owner varchar2(30)table_name varchar2(30),column_name varchar2(30),search_condition clob);INSERT INTO NOT NULL CONSTRAINTSSELECT dc.constraint_name, dc.owner, dc.table_name, dcc.column_name,to_lob(dc.search condition)FROM dba_constraints dc, dba_cons_columns dccWHERE dc.owner = dcc.ownerAND dc.constraint_name = dc c.constraint_nameAND dc.constraint_type = 'C'AND dc.owner = 'user_name';COMMIT;SELECT *FROM NOT_NULL_CONSTRAINTSWHERE dbms_lob.instr(search_condition, 'IS NOT NULL',1,1) > 0;NOT NULL constraints can be created on tables using Enterprise Manager and theCREATE TABLE T-SQL statement. To create a NOT NULL constraint using Enterprise Manager, follow thesesteps:1. In the Table Designer, the Allow Nulls column should be unchecked <strong>for</strong> en<strong>for</strong>cingthe NOT NULL constraint and checked to indicate a NULL constraint. To create a NOT NULL constraint Using T-SQL, use the following syntax:CREATE TABLE table_name(column_name datatype [ CONSTRAINT constraint_name ]{ NULL | NOT NULL },…)Check ConstraintBoth <strong>Oracle</strong> and SQL Server use the same syntax to define check constraints; both alsohave similar restrictions in its usage. CHECK constraints can be defined on a singlecolumn or multiple columns at the table level. The conditions specified in the CHECKclause should evaluate to a Boolean value of TRUE or FALSE. The conditions can referto other columns but are restricted to the row being modified.Both <strong>Oracle</strong> and SQL Server allow multiple CHECK constraints on a column. A columnconstraint can only reference the column it is being created on. Each constraint can havemultiple concatenated conditions. The process to create check constraints on tablesusing Enterprise Manager and T-SQL is provided in the following procedures. To create a check constraint using the Table Designer in Enterprise Manager,follow these steps:1. In the Table Designer, click the Manage Constraints button to bring up the tableProperties window with the Check Constraints pane active.2. Click the New button to add a constraint.