Tag: technology

SELECT

EXECUTE

ALTER TABLE

CREATE TABLE

DELETE

44

92

61

89

DYNM

NDYNAM

DYNA

DYNAM

6

8

7

9

string and date

character and numeric

integer and conversion

calendar and date

date and conversion

translation and date

12 bytes

16 bytes

14 bytes

10 bytes

A MERGE statement is used to merge the data of one table with data from another.

A MERGE statement can be used to update existing rows in a table.

A MERGE statement replaces the data of one table with that of another.

A MERGE statement can be used to insert new rows into a table.

Web as a platform

Web in mobile device

A standard

New architecture style

The UNIQUE constraint does not permit a null value for the column.

The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.

The NOT NULL constraint ensures that null values are not permitted for the column.

A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.

A subquery should retrieve only one row.

A subquery can retrieve zero or more rows.

Subqueries CANNOT be nested by more than two levels.

A subquery can be used only in SQL query statements.

A subquery CANNOT be used in an SQL query statement that uses group functions.

When a subquery is used with an inequality comparison operator in the outer SQL statement,