Types of indexes in progress 4gl
progress-4gl documentation: String manipulation. RIP Tutorial. en English (en) Français INDEX - return the position of a string in a string. R-INDEX will to the same thing but search right to left. INDEX(source, target) Search target within source (left to right) and return it's position. If it's missing return 0. The data types in parentheses are alternative data types that you can specify in the schema holder for your MS SQL Server data source. See Data Type Details for more details about each MS SQL Server data type, its ODBC SQL equivalent, and OpenEdge data type equivalent. How to use the ENTRY function with a non-comma-separated list How to use the ENTRY function when the list uses a separator other than a comma How to use the NUM-ENTRIES function with a non-default delimiter Introduction. There are two types of procedures in Progress ABL: internal procedures and procedure prototypes that are facades to Windows dlls or Unix/Linux shared library procedures. Just like with functions, procedures cannot be nested. You cannot nest functions in procedures and vice versa. A procedure is called with the RUN statement. Primary index is just simply a Favorite index. When the engine chooses the index because it is the primary index ( rule # 7 above) it would be better not to use an index at all. I believe that is what cost based optimization would suggested.
progress-4gl documentation: String manipulation. RIP Tutorial. en English (en) Français INDEX - return the position of a string in a string. R-INDEX will to the same thing but search right to left. INDEX(source, target) Search target within source (left to right) and return it's position. If it's missing return 0.
Using USE-INDEX When you use the USE-INDEX option in the record-phrase, Progress will use the index specified instead of those the compiler might have chosen. Example 1: Index Used: Custnum The specified index custnum will be used. FIND customer WHERE custnum = 45 USE-INDEX custnum. Example 2: Index Used: Name Consult your database vendor's documentation for more detailed information. For information regarding how to create and drop indexes, see your database system documentation. An index is a database structure that you can use to improve the performance of database activity. A database table can have one or more indexes associated with it. Progress 4GL will always use an index. Unless you specify exactly one record that you already know the RECID of. You do not have the option of not using an index when you program 4GL. There is a USE-INDEX keyword that allows you to over-ride the Progress compiler's choice of index but not using USE-INDEX does not result in no index being used. Example. There are a number of functions and methods for working with comma (or other character) separated lists in Progress 4GL. NUM-ENTRIES Returns the number of entries in a list. You can optionally specify delimiter, comma is default
An index is a database structure that you can use to improve the performance of database activity. A database table can have one or more indexes associated with it. An index is defined by a field expression that you specify when you create the index. Typically, the field expression is a single field name, like EMP_ID. An index created on the EMP_ID field, for example, contains a sorted list of the employee ID values in the table.
ABL (Advanced Business Language). Earlier known as Progress 4GL. Progress ABL is a programming language tied to the Progress OpenEdge environment, its database and surrounding utilities. This makes it a "fourth generation" programming language. Using USE-INDEX When you use the USE-INDEX option in the record-phrase, Progress will use the index specified instead of those the compiler might have chosen. Example 1: Index Used: Custnum The specified index custnum will be used. FIND customer WHERE custnum = 45 USE-INDEX custnum. Example 2: Index Used: Name Consult your database vendor's documentation for more detailed information. For information regarding how to create and drop indexes, see your database system documentation. An index is a database structure that you can use to improve the performance of database activity. A database table can have one or more indexes associated with it.
How to use entry and lookup function in the same program to display the string corresponding to the numbers. Ask Question Asked 2 years, 10 months ago. Progress 4GL how to count the number of delimiters in a string for use with index function. 1.
An index is a database structure that you can use to improve the performance of database activity. A database table can have one or more indexes associated with it. An index is defined by a field expression that you specify when you create the index. Typically, the field expression is a single field name, like EMP_ID. An index created on the EMP_ID field, for example, contains a sorted list of the employee ID values in the table. How to use entry and lookup function in the same program to display the string corresponding to the numbers. Ask Question Asked 2 years, 10 months ago. Progress 4GL how to count the number of delimiters in a string for use with index function. 1. If I comment out the WHERE clause and read the whole thing I get 26,994 "logical reads" (index entries plus records) This is the work the the db engine does to resolve the query. If I use "db-id <> 1600" (similar to "state <> 'MI' " in your example) I get the same result -- the whole table is scanned. progress-4gl documentation: String manipulation. RIP Tutorial. en English (en) Français INDEX - return the position of a string in a string. R-INDEX will to the same thing but search right to left. INDEX(source, target) Search target within source (left to right) and return it's position. If it's missing return 0. The data types in parentheses are alternative data types that you can specify in the schema holder for your MS SQL Server data source. See Data Type Details for more details about each MS SQL Server data type, its ODBC SQL equivalent, and OpenEdge data type equivalent. How to use the ENTRY function with a non-comma-separated list How to use the ENTRY function when the list uses a separator other than a comma How to use the NUM-ENTRIES function with a non-default delimiter Introduction. There are two types of procedures in Progress ABL: internal procedures and procedure prototypes that are facades to Windows dlls or Unix/Linux shared library procedures. Just like with functions, procedures cannot be nested. You cannot nest functions in procedures and vice versa. A procedure is called with the RUN statement.
To look up a topic, you scan the book index, locate the topic, and turn to the pages When you create the first index on any table, OpenEdge assumes it is the
In addition, since an OR is used, Progress selects the primary index in this case. FOR EACH customer WHERE (postalcode = "21000") OR (salesrep =Jim"): Example 5: Index Used: Name, Countrypost Two indexes are used, since both the matches are on the leading components of the index. FOR EACH customer WHERE (name begins "J") OR (country = "USA"):
Consult your database vendor's documentation for more detailed information. For information regarding how to create and drop indexes, see your database system documentation. An index is a database structure that you can use to improve the performance of database activity. A database table can have one or more indexes associated with it. Progress 4GL will always use an index. Unless you specify exactly one record that you already know the RECID of. You do not have the option of not using an index when you program 4GL. There is a USE-INDEX keyword that allows you to over-ride the Progress compiler's choice of index but not using USE-INDEX does not result in no index being used. Example. There are a number of functions and methods for working with comma (or other character) separated lists in Progress 4GL. NUM-ENTRIES Returns the number of entries in a list. You can optionally specify delimiter, comma is default An index is a database structure that you can use to improve the performance of database activity. A database table can have one or more indexes associated with it. An index is defined by a field expression that you specify when you create the index. Typically, the field expression is a single field name, like EMP_ID. An index created on the EMP_ID field, for example, contains a sorted list of the employee ID values in the table. How to use entry and lookup function in the same program to display the string corresponding to the numbers. Ask Question Asked 2 years, 10 months ago. Progress 4GL how to count the number of delimiters in a string for use with index function. 1.