SQL commands with subtraction and multiplication

In summary, you are asked to write general SQL statements that can be applied to other data with the same format. You should also be able to replace the given input, "Lagerreorganisation", with another project name and still get the desired output. Additionally, it is important to use primary keys in your queries, such as the combination of mnr and kompetenz for mitarb, and to not hardcode specific values, such as projnr 'p17'.
  • #36
mathmari said:
3) Which competencies (designation of competency) will be needed at least twice in the planned projects ?

SELECT p.projektbez
FROM projektzuord z, projekte p
GROUP BY p.projektbez, p.projnr
HAVING COUNT(p.projektbez)>=2 AND p.projnr = ANY (SELECT z.projnr FROM projektzuord z)
Shouldn't we list kompbez instead of projektbez? (Worried)
 
<h2>1. What is the syntax for using subtraction in SQL commands?</h2><p>The syntax for using subtraction in SQL commands is "SELECT column1 - column2 FROM table_name;" where column1 and column2 are the columns you want to subtract from each other and table_name is the name of the table containing the columns.</p><h2>2. Can you use subtraction with multiple columns in a SQL command?</h2><p>Yes, you can use subtraction with multiple columns in a SQL command by adding additional columns after the first subtraction sign. For example, "SELECT column1 - column2 - column3 FROM table_name;"</p><h2>3. How do you multiply values in SQL commands?</h2><p>To multiply values in SQL commands, you can use the asterisk (*) symbol. The syntax is "SELECT column1 * column2 FROM table_name;" where column1 and column2 are the columns you want to multiply.</p><h2>4. Can you use multiplication and subtraction in the same SQL command?</h2><p>Yes, you can use both multiplication and subtraction in the same SQL command. The order of operations follows the standard mathematical rules, so you can use parentheses to specify which operation should be performed first.</p><h2>5. Are there any limitations when using subtraction and multiplication in SQL commands?</h2><p>There are no specific limitations when using subtraction and multiplication in SQL commands, but it is important to ensure that the columns you are using are of the correct data type and that the resulting values make sense in the context of your data.</p>

Related to SQL commands with subtraction and multiplication

1. What is the syntax for using subtraction in SQL commands?

The syntax for using subtraction in SQL commands is "SELECT column1 - column2 FROM table_name;" where column1 and column2 are the columns you want to subtract from each other and table_name is the name of the table containing the columns.

2. Can you use subtraction with multiple columns in a SQL command?

Yes, you can use subtraction with multiple columns in a SQL command by adding additional columns after the first subtraction sign. For example, "SELECT column1 - column2 - column3 FROM table_name;"

3. How do you multiply values in SQL commands?

To multiply values in SQL commands, you can use the asterisk (*) symbol. The syntax is "SELECT column1 * column2 FROM table_name;" where column1 and column2 are the columns you want to multiply.

4. Can you use multiplication and subtraction in the same SQL command?

Yes, you can use both multiplication and subtraction in the same SQL command. The order of operations follows the standard mathematical rules, so you can use parentheses to specify which operation should be performed first.

5. Are there any limitations when using subtraction and multiplication in SQL commands?

There are no specific limitations when using subtraction and multiplication in SQL commands, but it is important to ensure that the columns you are using are of the correct data type and that the resulting values make sense in the context of your data.

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