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TECHONTHENET
TechOnTheNet - Online tutorials for Excel, SQL, Oracle, PLSQL and more! Your trusted resource for learning new technologies. We've been providing tutorials, references, and step-by-step instructions since 2003. TechOnTheNet.com is a great place to learn a new technology, or find a quick reference. It has never been easier to learn Database JAVASCRIPT: LANGUAGE TAGS (BCP 47) JavaScript: Language Tags (BCP 47) BCP 47 Language Tags is the Internet Best Current Practices (BCP) for language tags. The purpose of these language tags is to establish codes to help identify languages both spoken and written. A language tag is composed of a sequence of one or more subtags such as language, region, variant andscript subtags.
ORACLE / PLSQL: TRIGGERS The following is a list of topics that explain how to use Triggers inOracle / PLSQL:
POSTGRESQL: EXCEPT OPERATOR The PostgreSQL EXCEPT operator is used to return all rows in the first SELECT statement that are not returned by the second SELECT statement. Each SELECT statement will define a dataset. The EXCEPT operator will retrieve all records from the first dataset and then remove from the results all records from the second dataset. MARIADB: DISTINCT CLAUSE Let's look at how to use the DISTINCT clause to remove duplicates from more than one expression in MariaDB. For example: SELECT DISTINCT site_name, server_name FROM sites WHERE site_id < 30 ORDER BY site_name ASC, server_name DESC; This DISTINCT clause example would return each unique site_name and server_name combination from thesites table.
SQL SERVER: DELETE TOP STATEMENT This SQL Server tutorial explains how to use the DELETE TOP statement in SQL Server (Transact-SQL) with syntax and examples. The SQL Server (Transact-SQL) DELETE TOP statement is used to records from a table in SQL Server and limit the number of records deleted. MS ACCESS 2003: CONVERT A DATE TO A NUMERIC VALUE To do this, click on the Modules tab in the Database window and create a new module. Then paste in the following custom function: The function called ConvertDateToNumeric will convert a date into a number using a format of ddmmyyyy. Next, you'll need to use this function in your query. In the example above, we've used the ConvertDateToNumeric ORACLE / PLSQL: ORA-01430 ERROR MESSAGE Option #1. Rewrite your ALTER TABLE command to create a column with a unique name. Each column name must be unique within a table. For example, if you had a table called suppliers defined as follows: CREATE TABLE suppliers ( supplier_id number not null, supplier_name varchar2 (50) not null, city varchar2 (30), state varchar2 (2),zip_code
ORACLE / PLSQL: ORA-02449 ERROR MESSAGE Cause. You tried to drop a table that is referenced as a parent tableby a foreign key.
ORACLE / PLSQL: ORA-01790 ERROR MESSAGE Cause. You tried to execute a SELECT statement (probably a UNION query or a UNION ALL query), and all of the queries did not contain matching data types in the result columns.TECHONTHENET
TechOnTheNet - Online tutorials for Excel, SQL, Oracle, PLSQL and more! Your trusted resource for learning new technologies. We've been providing tutorials, references, and step-by-step instructions since 2003. TechOnTheNet.com is a great place to learn a new technology, or find a quick reference. It has never been easier to learn Database JAVASCRIPT: LANGUAGE TAGS (BCP 47) JavaScript: Language Tags (BCP 47) BCP 47 Language Tags is the Internet Best Current Practices (BCP) for language tags. The purpose of these language tags is to establish codes to help identify languages both spoken and written. A language tag is composed of a sequence of one or more subtags such as language, region, variant andscript subtags.
ORACLE / PLSQL: TRIGGERS The following is a list of topics that explain how to use Triggers inOracle / PLSQL:
POSTGRESQL: EXCEPT OPERATOR The PostgreSQL EXCEPT operator is used to return all rows in the first SELECT statement that are not returned by the second SELECT statement. Each SELECT statement will define a dataset. The EXCEPT operator will retrieve all records from the first dataset and then remove from the results all records from the second dataset. MARIADB: DISTINCT CLAUSE Let's look at how to use the DISTINCT clause to remove duplicates from more than one expression in MariaDB. For example: SELECT DISTINCT site_name, server_name FROM sites WHERE site_id < 30 ORDER BY site_name ASC, server_name DESC; This DISTINCT clause example would return each unique site_name and server_name combination from thesites table.
SQL SERVER: DELETE TOP STATEMENT This SQL Server tutorial explains how to use the DELETE TOP statement in SQL Server (Transact-SQL) with syntax and examples. The SQL Server (Transact-SQL) DELETE TOP statement is used to records from a table in SQL Server and limit the number of records deleted. MS ACCESS 2003: CONVERT A DATE TO A NUMERIC VALUE To do this, click on the Modules tab in the Database window and create a new module. Then paste in the following custom function: The function called ConvertDateToNumeric will convert a date into a number using a format of ddmmyyyy. Next, you'll need to use this function in your query. In the example above, we've used the ConvertDateToNumeric ORACLE / PLSQL: ORA-01430 ERROR MESSAGE Option #1. Rewrite your ALTER TABLE command to create a column with a unique name. Each column name must be unique within a table. For example, if you had a table called suppliers defined as follows: CREATE TABLE suppliers ( supplier_id number not null, supplier_name varchar2 (50) not null, city varchar2 (30), state varchar2 (2),zip_code
ORACLE / PLSQL: ORA-02449 ERROR MESSAGE Cause. You tried to drop a table that is referenced as a parent tableby a foreign key.
ORACLE / PLSQL: ORA-01790 ERROR MESSAGE Cause. You tried to execute a SELECT statement (probably a UNION query or a UNION ALL query), and all of the queries did not contain matching data types in the result columns. ORACLE / PLSQL: TRIGGERS The following is a list of topics that explain how to use Triggers inOracle / PLSQL:
ORACLE / PLSQL: UPDATE STATEMENT This Oracle tutorial explains how to use the Oracle UPDATE statement with syntax, examples, and practice exercises. The Oracle UPDATE statement is used to update existing records in a table in an Oracle database. There are 2 syntaxes for an update query in Oracle. MS ACCESS: WHILE...WEND STATEMENT MS Access: WHILEWEND Statement This MSAccess tutorial explains how to use the Access WHILEWEND statement to create a WHILE loop in VBA with syntax and examples.. Description. The Microsoft Access WHILEWEND statement is used to create a WHILE loop in VBA. SQL: PRACTICE EXERCISES FOR INSERT STATEMENT Solution for Practice Exercise #1: The following INSERT statement would insert this record into the employees table: Try It. INSERT INTO employees (employee_number, last_name, first_name, salary, dept_id) VALUES (1005, 'Johnson', 'Sally', 58000, 500); The employees table would now look like this: employee_number. ORACLE / PLSQL: RPAD FUNCTION This Oracle tutorial explains how to use the Oracle / PLSQL RPAD function with syntax and examples. The Oracle / PLSQL RPAD function pads the right-side of a string with a specific set of characters (when string1 is not null). MS EXCEL 2016: STEP INTO Step Into. While in debug mode, you can "Step Into" your VBA code in Excel 2016. You can choose to "Step Into" your code in Excel 2016. What this means is that you will step through each line of code in your current procedure as well as step into the code of any proceduresthat are
MS ACCESS 2013: DISPLAY ONLY UNIQUE VALUES IN A COMBO BOX When the Query Properties window appears, set the Unique Values property to "Yes". Next, close the query builder window by clicking on the X in the top right corner of the Query Builder window. You will be prompted to save the changes. Click on the "Yes" button. Now when you view the values in the combo box, you will see that only unique values ORACLE / PLSQL: ORA-06512 ERROR MESSAGE Learn the cause and how to resolve the ORA-06512 error message in Oracle. This error is caused by the stack being unwound by unhandled exceptions in your PLSQL code ORACLE / PLSQL: ORA-06550 ERROR MESSAGE Learn the cause and how to resolve the ORA-06550 error message in Oracle. You tried to compile a block of PLSQL code (like a stored procedure or function), but a ORACLE / PLSQL: ORA-00932 ERROR MESSAGE Cause. You tried to perform an operation between two different datatypes, but the datatypes are not compatible.TECHONTHENET
TechOnTheNet - Online tutorials for Excel, SQL, Oracle, PLSQL and more! Your trusted resource for learning new technologies. We've been providing tutorials, references, and step-by-step instructions since 2003. TechOnTheNet.com is a great place to learn a new technology, or find a quick reference. It has never been easier to learn Database JAVASCRIPT: LANGUAGE TAGS (BCP 47) JavaScript: Language Tags (BCP 47) BCP 47 Language Tags is the Internet Best Current Practices (BCP) for language tags. The purpose of these language tags is to establish codes to help identify languages both spoken and written. A language tag is composed of a sequence of one or more subtags such as language, region, variant andscript subtags.
POSTGRESQL: EXCEPT OPERATOR The PostgreSQL EXCEPT operator is used to return all rows in the first SELECT statement that are not returned by the second SELECT statement. Each SELECT statement will define a dataset. The EXCEPT operator will retrieve all records from the first dataset and then remove from the results all records from the second dataset. SQL SERVER: DELETE TOP STATEMENT This SQL Server tutorial explains how to use the DELETE TOP statement in SQL Server (Transact-SQL) with syntax and examples. The SQL Server (Transact-SQL) DELETE TOP statement is used to records from a table in SQL Server and limit the number of records deleted. MS EXCEL 2011 FOR MAC: DELETE A SHEET To delete a sheet, simply right-click on the name of the sheet that you wish to delete. In this example, we want to delete Sheet1. Then select Delete from the popup menu. A message will pop up asking you to confirm the deletion of the sheet. Click on the OK button to continue. Now when you return to the spreadsheet, the sheet will be deleted. SQLITE: JULIANDAY FUNCTION Description. The SQLite julianday function takes a date, allows you to apply modifiers and then returns the date as a Julian Day. A Julian Day is the number of days since Nov 24, 4714 BC 12:00pm Greenwich time in the Gregorian calendar. MS ACCESS 2003: CONVERT A DATE TO A NUMERIC VALUE To do this, click on the Modules tab in the Database window and create a new module. Then paste in the following custom function: The function called ConvertDateToNumeric will convert a date into a number using a format of ddmmyyyy. Next, you'll need to use this function in your query. In the example above, we've used the ConvertDateToNumeric ORACLE / PLSQL: ORA-01790 ERROR MESSAGE Cause. You tried to execute a SELECT statement (probably a UNION query or a UNION ALL query), and all of the queries did not contain matching data types in the result columns. ORACLE / PLSQL: ORA-02449 ERROR MESSAGE Cause. You tried to drop a table that is referenced as a parent tableby a foreign key.
ORACLE / PLSQL: ORA-06502 ERROR MESSAGE Learn the cause and how to resolve the ORA-06502 error message in Oracle. You tried to execute a statement that resulted in an arithmetic, numeric, string, conversionTECHONTHENET
TechOnTheNet - Online tutorials for Excel, SQL, Oracle, PLSQL and more! Your trusted resource for learning new technologies. We've been providing tutorials, references, and step-by-step instructions since 2003. TechOnTheNet.com is a great place to learn a new technology, or find a quick reference. It has never been easier to learn Database JAVASCRIPT: LANGUAGE TAGS (BCP 47) JavaScript: Language Tags (BCP 47) BCP 47 Language Tags is the Internet Best Current Practices (BCP) for language tags. The purpose of these language tags is to establish codes to help identify languages both spoken and written. A language tag is composed of a sequence of one or more subtags such as language, region, variant andscript subtags.
POSTGRESQL: EXCEPT OPERATOR The PostgreSQL EXCEPT operator is used to return all rows in the first SELECT statement that are not returned by the second SELECT statement. Each SELECT statement will define a dataset. The EXCEPT operator will retrieve all records from the first dataset and then remove from the results all records from the second dataset. SQL SERVER: DELETE TOP STATEMENT This SQL Server tutorial explains how to use the DELETE TOP statement in SQL Server (Transact-SQL) with syntax and examples. The SQL Server (Transact-SQL) DELETE TOP statement is used to records from a table in SQL Server and limit the number of records deleted. MS EXCEL 2011 FOR MAC: DELETE A SHEET To delete a sheet, simply right-click on the name of the sheet that you wish to delete. In this example, we want to delete Sheet1. Then select Delete from the popup menu. A message will pop up asking you to confirm the deletion of the sheet. Click on the OK button to continue. Now when you return to the spreadsheet, the sheet will be deleted. SQLITE: JULIANDAY FUNCTION Description. The SQLite julianday function takes a date, allows you to apply modifiers and then returns the date as a Julian Day. A Julian Day is the number of days since Nov 24, 4714 BC 12:00pm Greenwich time in the Gregorian calendar. MS ACCESS 2003: CONVERT A DATE TO A NUMERIC VALUE To do this, click on the Modules tab in the Database window and create a new module. Then paste in the following custom function: The function called ConvertDateToNumeric will convert a date into a number using a format of ddmmyyyy. Next, you'll need to use this function in your query. In the example above, we've used the ConvertDateToNumeric ORACLE / PLSQL: ORA-01790 ERROR MESSAGE Cause. You tried to execute a SELECT statement (probably a UNION query or a UNION ALL query), and all of the queries did not contain matching data types in the result columns. ORACLE / PLSQL: ORA-02449 ERROR MESSAGE Cause. You tried to drop a table that is referenced as a parent tableby a foreign key.
ORACLE / PLSQL: ORA-06502 ERROR MESSAGE Learn the cause and how to resolve the ORA-06502 error message in Oracle. You tried to execute a statement that resulted in an arithmetic, numeric, string, conversion ORACLE / PLSQL: USER FUNCTION (RETRIEVING USERNAME) Example. Let's look at some Oracle USER function examples and explore how to use the USER function in Oracle/PLSQL. For example: parm_user_ID := USER; OR. select USER into parm_user_ID from dual; The variable called parm_user_ID will now contain the Oracle user ID from the current Oracle session. MS ACCESS: AND FUNCTION The And function with this syntax can only be used in VBA code in Microsoft Access. Let's look at an example that combines the And function with the If Statement in VBA: This would set the LResult variable to the string value "High" if both LWebsite was "TechOnTheNet.com" and LCount > 250. Otherwise, it would set the LResult variable to the SQL EDITOR: TRY JOINS Instructions. To start, enter your query in the SQL Statement field. If you clicked on a "Try It" button in a tutorial, we have entered an example statement to get you started. When you are ready to try your SQL statement, click the "Execute SQL" button and watch for the results to appear in the Query Results section. ORACLE / PLSQL: INTERSECT OPERATOR This Oracle tutorial explains how to use the Oracle INTERSECT operator with syntax and examples. The Oracle INTERSECT operator is used to return the results of 2 or more SELECT queries. However, it only returns the rows selected by all queries. MS ACCESS: WHILE...WEND STATEMENT MS Access: WHILEWEND Statement This MSAccess tutorial explains how to use the Access WHILEWEND statement to create a WHILE loop in VBA with syntax and examples.. Description. The Microsoft Access WHILEWEND statement is used to create a WHILE loop in VBA. ORACLE / PLSQL: ORA-06512 ERROR MESSAGE Learn the cause and how to resolve the ORA-06512 error message in Oracle. This error is caused by the stack being unwound by unhandled exceptions in your PLSQL code ORACLE / PLSQL: ORA-02291 ERROR MESSAGE Cause. You tried to reference a table using a unique or primary key, but the columns that you listed did not match the primary key, or a primary key does not exist for this table. SQL SERVER: CHANGE A PASSWORD IN SQL SERVER SQL Server: Change a password in SQL Server Question: How do I change the password for a user/login in SQL Server? Answer: In SQL Server, the password is associated with the SQL Server Login. The Login is then mapped to the database user. So to change a password in SQL Server, you need to execute the ALTER LOGIN statement. ORACLE / PLSQL: ORA-06550 ERROR MESSAGE Learn the cause and how to resolve the ORA-06550 error message in Oracle. You tried to compile a block of PLSQL code (like a stored procedure or function), but a ORACLE / PLSQL: ORA-04091 ERROR MESSAGE Option #1. Re-write the trigger/function so that it does not try to modify/query the table in question. For example, if you've created a trigger against the table called orders and then the trigger performed a SELECT against the orders table as follows: When you create a trigger against a table, you can't modify/query that table until the* Home
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