Complete the dialogue by adding one preposition in each gap. Luke: You’ve been studying for ages. What are you
Complete the dialogue by adding one preposition in each gap.
Luke: You’ve been studying for ages. What are you up to?
Agnes: I’m working on my IT homework and it’s really complicated. Are you skilled in computer programming?
Luke: I’m quite good. Let’s have a look.
Agnes: Thanks, Luke.
Luke: Everything that you’ve done so far is correct, I believe. I’m not aware of any mistakes.
Agnes: That’s a relief!
Luke: You shouldn’t worry so much. You should be proud of your progress.
Agnes: Yes, I guess you’re right. I find it much easier now than at the beginning of the year. We have an exam next week.
Luke: You’ve been studying for ages. What are you up to?
Agnes: I’m working on my IT homework and it’s really complicated. Are you skilled in computer programming?
Luke: I’m quite good. Let’s have a look.
Agnes: Thanks, Luke.
Luke: Everything that you’ve done so far is correct, I believe. I’m not aware of any mistakes.
Agnes: That’s a relief!
Luke: You shouldn’t worry so much. You should be proud of your progress.
Agnes: Yes, I guess you’re right. I find it much easier now than at the beginning of the year. We have an exam next week.
Rys 45
week and I really want to do well. I’ve been working hard to prepare for it.Luke: That’s great to hear. I’m sure you will do well. What topics are you struggling with the most?
Agnes: I find the topic on databases particularly challenging. I have trouble understanding the different relationships between tables and how to create queries.
Luke: Don’t worry, I can help you with that. First, let"s start by understanding the purpose of databases. Databases are used to store and organize large amounts of data in a structured way. They consist of tables, which are like spreadsheets, with rows and columns.
Agnes: I understand the concept of tables, but I struggle with the relationships between them.
Luke: No problem, I"ll explain. In databases, tables can have different types of relationships. The most common ones are one-to-one, one-to-many, and many-to-many relationships.
Agnes: Can you give me an example of each?
Luke: Sure! A one-to-one relationship is when one record in a table is associated with exactly one record in another table. For example, in a database of employees, each employee may have one and only one payroll record.
Agnes: I see. What about a one-to-many relationship?
Luke: In a one-to-many relationship, one record in a table is associated with multiple records in another table. For instance, in a database of orders and customers, one customer can have multiple orders, but each order is associated with only one customer.
Agnes: Okay, that makes sense. What about many-to-many relationships?
Luke: A many-to-many relationship exists when multiple records in one table are associated with multiple records in another table. For example, in a database of students and courses, one student can be enrolled in multiple courses, and one course can have multiple students.
Agnes: Thank you for explaining that. It"s much clearer now.
Luke: You"re welcome! Understanding these relationships is important because they allow you to retrieve specific data using queries. To create queries, you need to use Structured Query Language (SQL) to specify the criteria for the data you want to retrieve.
Agnes: I"ve heard of SQL before, but I"m not very familiar with it.
Luke: SQL is a programming language specifically designed for managing and manipulating databases. It allows you to perform various operations such as selecting, inserting, updating, and deleting data from tables. I can show you some basic SQL statements to get you started.
Agnes: That would be great! I really appreciate your help, Luke.
Luke: No problem at all, Agnes. We can go through some examples together and practice creating queries. Just remember to take it step by step, and don"t hesitate to ask me any questions along the way.