barcode reader java download Use of typecasting functions and automatic typecasting in Software

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Use of typecasting functions and automatic typecasting
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Oracle can convert datatypes automatically if necessary, and if the format of the data is suitable Note that the accuracy of the typecasting can be dependent on the data In the example, the date is being interpreted as a European-style date (day-month-year), which might not be intended if the users happen to use American styles (month-dayyear), which would throw an error, or African style (year-month-day), which would work but not as intended Do not rely on automatic typecasting It can impact on performance and may not always workThe Oracle environment is strongly typed, and your programmers should respect this
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The syntax for creating a table requires giving the table a name (which must be unique within the namespace in the schema to which the table belongs) and specifying one or more columns, each with a datatype It is also possible to specify constraints when creating a table; alternatively, constraints can be added later There are many examples in this book of creating tables from the SQL*Plus command line (there have already been two examples in this chapter), but it can also be done through Database Control Database Control provides a fully functional menu-driven interface for creating and editing table structures, and also for managing the constraints, indexes, and views that will be based on the tables All tables require storage Unless specified otherwise, tables will be created with one extent in the creator s default tablespace Any other tablespace on which the user has a quota can be specified at creation time, or a table can be moved to a different tablespace later To reach the table management window of Database Control, from the database home page take the Schema tab, then the Tables link in the Database Objects section, as shown in Figure 9-4 Enter whatever search criteria are needed to locate the table of interest; note that double quotes can be used to find tables with non-standard names and the % wildcard Click the Actions drop-down box to see what possibilities are available
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The actions are:
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CREATE LIKE CREATE INDEX CREATE SYNONYM CREATE TRIGGER GENERATE DDL OBJECT PRIVILEGES MANAGE OPTIMIZER STATISTICS REORGANIZE RUN SEGMENT ADVISOR SHRINK SEGMENT SHOW DEPENDENCIES VIEW DATA FLASHBACK TABLE FLASHBACK VERSIONS QUERY FLASHBACK TRANSACTION LOG MINER Create a new table based on the same structure as the selected table Define and generate an index on the table Create a logical name, or alias, that can be used as a pseudonym for the table Create a block of PL/SQL code will run automatically whenever DML is executed against the table Reverse-engineer the table definition, to produce a CREATE TABLE statement that could be used to reproduce the table Give users permission to read or alter the data in the table Analyze the contents of the table, to gather statistics used by the optimizer to work out how best to access the table Runs a wizard to take you through the process or reorganizing the data in a table to move the table, or to change its structure Use the advisor to generate a recommendation for whether the table should be shrunk Use the online reorganization tool to reclaim wasted space from a segment Display all the objects that are in some way related to the table and so could be affected by any action on the table This wizard assists with querying and displaying the contents of the table Reverse any DML against the table, in reverse chronological order, to take the table back to a previous state Query historical data, to display previous versions of rows Find and reverse transactions against the table Investigate all DML that has been executed against the table
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The Edit button goes to a window that will display the column structures of the table From here, columns can be added, dropped, and modified Examples of the SQL to do this are
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alter table dept add (started date); alter table dept modify (started timestamp); alter table dept drop column started;
In this example, the first command adds a column STARTED to the table, datatype DATE The second command modifies the datatype to TIMESTAMP The third command drops the column
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