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Literal strings

From: MySQL Essential Training

Video: Literal strings

You use literal values for a lot of purposes for example when you add One string there, another string here which is a comma Now, in MYSQL, you can also do this like this with a backslash, and a single quote.

Literal strings

You use literal values for a lot of purposes for example when you add or update rows to a table, you'll often use literals for the new values. Literal strings in MYSQL deserve some attention because there are some ways in which they can be different from the SQL standard. For example, I say select hello world with the single quotes around the string and a semicolon, press Go, we get hello world. So this is standard SQL and standard SQL literal string.

Has single quotes and the characters are inside of the single quotes. Now, if I want to concatenate strings in MYSQL, you can do that like this. And this will give me the same result. Press Go, and that's exactly the same result. Now, you notice what we have here is we have three strings. One string there, another string here which is a comma and a space, and another string here with the word world. So, those are three separate strings, each in single quotes and just separated by spaces like this.

And in MySQL that with concatenate the strings and it's really important to note that this is not standard SQL. You'll see this a lot in MySQL, but this is not standard SQL and it will not work in other database systems. So here's another thing that will not work in other database systems. But this is also very common in MySQL. And that is using double quotes for the literal strings. You'll notice again we have exactly the same. Result, and here we're using double quotes for the string.

This is legal in MySQL, it's common in MySQL, it does not work in other database systems. It is not standard SQL and I suggest that you don't do this. When you want to use a literal string, I strongly suggest that you just use the single quote marks, because someday you might want to take that SQL and port it to another. Database system and hopefully it'll work. Now if you have a literal string with single quote marks and you want to put something in double quotes you just add the double quotes like this.

And this will work. Now the word world will have double quotes around it. And that works just fine and it's perfectly legal in standard SQL. Now if you want to put single quotes around that string, the standard way to do that is like this. Two single quotes next to each other is interpreted as one single quote inside of the literal string. So here's one single quote inside the literal string. And here's another single quote inside the literal string. And when I press Go.

You see, we get the single quote around the word world. Now, in MYSQL, you can also do this like this with a backslash, and a single quote. That's one single quote, and that's one single quote, and that works, and it get's you exactly the same results. Again, this is not standard. This probably won't work in other database systems. So, literally strings in MYSQL can vary from the standard somewhat. I strongly recommend that you stick to standard strings as much as you can so that your SQL is more portable.

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This video is part of

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MySQL Essential Training

60 video lessons · 5859 viewers

Bill Weinman
Author

 
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  1. 4m 22s
    1. Welcome
      1m 3s
    2. Using the exercise files
      1m 31s
    3. What is MySQL?
      1m 48s
  2. 45m 37s
    1. Installation overview
      3m 16s
    2. Installing XAMPP on Windows
      5m 55s
    3. Installing XAMPP on the Mac
      6m 38s
    4. Setting up MySQL users
      11m 31s
    5. Installing SID on Windows
      5m 43s
    6. Installing SID on the Mac
      6m 6s
    7. Installing time zone support in MySQL on Windows
      6m 28s
  3. 45m 43s
    1. The SELECT statement
      3m 57s
    2. Selecting rows
      4m 57s
    3. Selecting columns
      3m 8s
    4. Sorting results with ORDER BY
      2m 58s
    5. Filtering results with WHERE
      3m 52s
    6. Filtering results with LIKE and IN
      3m 41s
    7. Filtering results with regular expressions
      8m 21s
    8. Inserting rows
      4m 9s
    9. Updating rows
      2m 21s
    10. Deleting rows
      2m 25s
    11. Literal strings
      3m 12s
    12. Understanding NULL
      2m 42s
  4. 41m 47s
    1. Creating a database
      4m 30s
    2. Creating a table
      7m 18s
    3. Creating indexes
      6m 8s
    4. Controlling column behavior with constraints
      4m 46s
    5. Creating an ID column
      6m 58s
    6. Using foreign key constraints
      7m 58s
    7. Altering a table
      4m 9s
  5. 28m 56s
    1. What are data types?
      4m 1s
    2. Numeric types
      5m 21s
    3. String types
      2m 58s
    4. Date and time types
      7m 2s
    5. Bit type
      2m 26s
    6. Boolean values
      2m 15s
    7. Enumeration types
      4m 53s
  6. 32m 34s
    1. String functions
      6m 57s
    2. Numeric functions
      6m 2s
    3. Date and time functions
      4m 12s
    4. Time zones in MySQL
      3m 37s
    5. Formatting dates
      1m 51s
    6. Aggregate functions
      5m 45s
    7. Flow control with CASE
      4m 10s
  7. 7m 6s
    1. Maintaining database integrity with transactions
      4m 46s
    2. Using transactions for performance
      2m 20s
  8. 16m 49s
    1. Updating a table with a trigger
      5m 11s
    2. Preventing automatic updates with a trigger
      7m 29s
    3. Logging transactions with a trigger
      4m 9s
  9. 14m 11s
    1. Creating a simple subselect
      3m 23s
    2. Searching within a result set
      3m 53s
    3. Creating a view
      3m 32s
    4. Creating a joined view
      3m 23s
  10. 12m 26s
    1. Understanding MySQL stored routines
      2m 0s
    2. Creating a stored function
      4m 34s
    3. Creating a stored procedure
      5m 52s
  11. 14m 4s
    1. The multi-platform PDO interface
      3m 44s
    2. Executing the SQL
      4m 8s
    3. Implementing auto-increment IDs
      2m 3s
    4. Using a stored funciton
      4m 9s
  12. 1m 3s
    1. Goodbye
      1m 3s

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