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Example: ALTER TABLE CUSTOMER_ACCOUNT ADD CONSTRAINT CK_CUSTOMER_DEPOSIT_AMOUNT CHECK (CUSTOMER_DEPOSIT_AMOUNT >= 0 OR CUSTOMER_DEPOSIT_AMOUNT IS NULL);
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Dropping the primary key of the table. If the primary key is referenced by any referential constraints, those must be dropped rst.
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ALTER TABLE table_name DROP PRIMARY KEY;
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Renaming a column. Of the databases surveyed, only Oracle (version 8.0 or higher) supports this syntax. However, Microsoft SQL Server has a stored procedure called sp_rename that provides a way to rename database columns, tables, and other database objects.
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ALTER TABLE table_name RENAME old_column_name TO new_column_name;
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The DROP Statement
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The DROP statement is the simplest of the DDL statements. The basic syntax is
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DROP <object_type> object_name [<drop_options>]
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The object type names the type of object to be dropped, such as INDEX, TABLE, or VIEW. The drop options are DBMS-speci c. In particular, if a table is referenced by any referential constraints, the DBMS will generally prevent you from dropping it. However, several DBMSs provide a cascade option that tells the DBMS to drop any referential constraints that get in the way of dropping the table. Unfortunately, the syntax is not consistent across vendors PostgreSQL and MySQL use the keyword CASCADE for this purpose, but Oracle requires the keyword CASCADE CONSTRAINTS. Here are a few examples. Beware: once you drop something, it s gone there is no undo command in relational databases, and SQL doesn t ask Are you sure
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DROP DROP DROP DROP TABLE TABLE TABLE INDEX CUSTOMER_ACCOUNT; CUSTOMER_ACCOUNT CASCADE CONSTRAINTS; (Oracle) CUSTOMER_ACCOUNT CASCADE; (MySQL / PostgreSQL) IX_MOVIE_TITLE;
CHAPTER 3 De ning Database Objects Using SQL
Quiz
Choose the correct responses to each of the multiple-choice questions. Note that there may be more than one correct response to each question. 1. The bene ts of data types are a. They conform to published standards b. They provide a set of behaviors useful to database users c. They provide data independence d. They restrict column data to characters that make sense e. They assist the DBMS in ef ciently storing column data 2. Character data types a. Are more exible than numeric data types b. Support both xed- and variable-length column data c. Always require speci cation of the precision and scale d. Cause columns to be padded with length out to the maximum length e. Can store strings in national language formats 3. Numeric data types a. Are more exible than character data types b. Restrict column values to numbers and related symbols such as commas and dollar signs c. Always require speci cation of precision and scale d. Store either exact or approximate values e. Are well suited to use in calculations 4. Standard numeric types include a. INTEGER b. NUMBER c. FLOAT d. BOOLEAN e. INTERVAL
5. Standard temporal data types include a. DATETIME b. DATE c. TIMESTAMP d. TIMEZONE e. TIME 6. NULL values
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a. Can be used to represent missing or unknown data values b. Are the same as blanks (spaces) c. Are equal to other NULL values d. Are not equal to other NULL values e. Are always allowed by default 7. DDL statements include a. CREATE b. ALTER c. DELETE d. INSERT e. UPDATE 8. The CREATE DATABASE statement a. Works exactly the same way in all relational DBMSs b. Always speci es the database name c. Always speci es the database owner s name d. May include vendor-speci c parameters e. Works the same as the CREATE SCHEMA statement 9. The column de nition in the CREATE TABLE statement may include a. The table name b. The column name c. A table constraint d. A DEFAULT clause e. A NULL or NOT NULL clause
CHAPTER 3 De ning Database Objects Using SQL
10. A table column name a. Must be speci ed in the CREATE TABLE statement b. Must be unique within the database c. Must be unique within the table d. May only be named in one index e. Must be speci ed in the ALTER TABLE statement 11. A column constraint a. May reference one or more columns b. May be included in either a CREATE TABLE or ALTER TABLE statement c. Uses syntax that is identical or nearly identical to a table constraint of the same type d. Can be used anywhere a table constraint can be used e. Has syntax that varies little from one constraint type to another 12. The correct syntax for a DEFAULT clause is a. DEFAULT (precision,scale) b. DEFAULT [NULL | NOT NULL] c. DEFAULT (expression) d. DEFAULT (column_name) REFERENCES table_name (column_name) e. DEFAULT [UNIQUE | PRIMARY KEY] 13. The correct syntax for a NOT NULL constraint is a. column_name data_type IS NOT NULL b. column_name data_type NOT NULL c. DEFAULT [NULL | NOT NULL] d. CREATE NOT NULL INDEX ON column_name e. column_name REFERENCES NOT NULL 14. The correct syntax for a UNIQUE CONSTRAINT is a. [CONSTRAINT constraint_name] UNIQUE (column_name) b. [CONSTRAINT constraint_name] UNIQUE (table_name) c. DEFAULT UNIQUE (column_name) d. column_name REFERENCES UNIQUE table_name e. DEFAULT [UNIQUE | PRIMARY KEY]
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