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Oracle PL/SQL/Constraints/Alter Constraints - История изменений
2026-04-04T10:38:54Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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Admin: 1 версия
2010-05-26T10:01:58Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Adding a check constraint that allows null values==<br />
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<!-- start source code --><br />
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<source lang="sql"><br />
<br />
SQL><br />
SQL><br />
SQL> CREATE TABLE product (<br />
2 product_name VARCHAR2(25),<br />
3 product_price NUMBER(4,2),<br />
4 purchase_date DATE<br />
5 );<br />
Table created.<br />
SQL><br />
SQL> ALTER TABLE product ADD (<br />
2 CONSTRAINT reasonable_stock_date CHECK(<br />
3 TO_CHAR(purchase_date, "YYYY-MM-DD") >= "2001-12-31"<br />
4 )<br />
5 );<br />
Table altered.<br />
SQL><br />
SQL> INSERT INTO product VALUES ("S", 49, "30-DEC-01");<br />
INSERT INTO product VALUES ("S", 49, "30-DEC-01")<br />
*<br />
ERROR at line 1:<br />
ORA-02290: check constraint (sqle.REASONABLE_STOCK_DATE) violated<br />
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SQL><br />
SQL> drop table product;<br />
Table dropped.<br />
SQL><br />
SQL><br />
</source></div>
Admin