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SQL stands for ‘Structured Query Language’. This is basically a allegorical accent acclimated for autumn and retrieving abstracts in a database.

If you’ve heard of SQL, it’s apparently in the ambience of MySQL, SQL Server, Oracle, or SQLite. You may alike accept affected these were programming languages in and of themselves. In reality, these are artlessly database types which use SQL. Anniversary has hardly altered syntax, but it’s about a distinct accent with assorted applications.

This is able actuality and it’s able-bodied account acquirements if you’re at all absorbed in Android development.

In Android development, we tend to use SQLite which is ideal for adaptable applications and decidedly advantageous for assuredly autumn data. MySQL is added frequently installed on servers area it can be acclimated by web apps. Either way, application databases to abundance advice allows us to adapt that abstracts in a far added analytic and structured manner, and afresh admission and dispense that advice dynamically.

Databases acquiesce us to administer algorithms beyond huge abstracts sets and alike to monetize the abstracts we’ve calm from users. While there are added ‘non-SQL’ options for communicating with a database, SQL has actual abundant become the industry accepted (succeeding Codasyl). This is able actuality and it’s able-bodied account acquirements if you’re at all absorbed in Android development.

If you’ve aloof abstruse Java and you’re currently addled from the ordeal, don’t worry. SQL is not a abounding programming accent in the aforementioned faculty as Java. It’s afterpiece to article like HTML or conceivably the argumentation of a spreadsheet. It’s mainly acclimated for putting abstracts into a table and afresh extracting that abstracts based on altered filters.

The best way to alpha out is to account a relational database. This is about a alternation of tables like in Excel. This anatomy allows us to adapt abstracts into columns and rows, which in about-face allows for a lot of altered operations.

You adeptness use a database to abundance a account of clients... Or we adeptness go big and use a server to aggregate arcade preferences from bags of apps and afresh advertise that database on!

For instance, you adeptness use a database to abundance a account of clients. You could ample out their abstracts beyond rows in your table so that you accept their names, ages, acquaintance details, genders, and any added pertinent information. Pulling out a accurate name will accompany all their details, basic you to alarm them up and woo them into affairs your product.

You could additionally cull out all of the contacts of a accurate age, or all of the contacts amid in a accurate city. If you were architecture a acquaintance administration app, afresh you’d about aloof be creating a appealing UX for accessing that database. SQL would afresh be acting as a agent for your Java and the database. In the case of Android development, that adeptness be an SQLite database stored on the accessory as a argument file. Likewise, we adeptness do article agnate as a acceptable way to abundance amateur abstracts like aerial array or go big and use a server to aggregate arcade preferences from bags of apps and advertise that database.

So, you accept your affairs and you accept your database with applicant details, usernames and passwords, or players and aerial scores. There are a cardinal of altered accomplishments you adeptness ambition to accomplish to get to this point and to accomplish use of the database activity forward.

These accomplishments are performed via statements. So, for example, in adjustment to actualize a new table, we do so by application CREATE TABLE. To add added data, we use INSERT INTO. To annul data, we use DELETE.

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When application any of these commands, it is advantageous to accumulate a ‘picture’ of your table in apperception and bethink that you’re mostly apropos to specific rows and columns.

For the best part, it’s adequately intuitive. In a moment we’ll analyze how to use anniversary account and what it can do in added detail.

As in any computer accent though, these statements charge to be accounting in the actual way in adjustment to be accepted and to action properly. Statements are not case sensitive, so autograph baddest works aloof as able-bodied as autograph SELECT. However, it can be a acceptable addiction to use capitals in adjustment to differentiate the statements from the names and the abstracts at a glance. Columns and rows meanwhile are afar by commas and generally brackets are acclimated to accumulation abstracts together. Some databases will crave you to use a semicolon at the end of your statements to announce the end but others do not. This is an archetype of the slight aberration in syntax that can crop up aback you move from one arrangement to another. In this case, we’ll be application the syntax for SQLite3, as that’s apparently what you’ll use aback developing for Android.

As in any computer accent though, these commands charge to be accounting in the actual way in adjustment to be accepted and to action properly.

When application any of these commands, it is advantageous to accumulate a ‘picture’ of your table in mind. Bethink you’re mostly apropos to specific rows and columns.

There are a abundant abounding altered SQL statements that you can use to administer your databases. However, best Android developers will acquisition themselves relying on a few key statements.

The aboriginal affair you’ll charge to do is to actualize your database. Some databases will let you do this with CREATE DATABASE, but in SQLite3, you use $sqlite, followed by the database name. You’ll apparently do this application a Java class, depending on how you appetite to go about it. But already you’ve done that, you’re acceptable to get started with a accomplished ambit of altered statements.

A database needs tables. The abutting footfall afresh will be to use CREATE TABLE in adjustment to body one. This is afresh appealing straightforward, as continued as you can brainstorm the table actuality congenital in columns.

Here we are creating our table alleged ‘Clients’ afore defining anniversary cavalcade with the abstracts we want. The blazon of abstracts we’re autumn is adumbrated by ‘text’ and ‘integer’. If you accept any coding acquaintance you’ll be accustomed with the appellation ‘int’— acceptation ‘integer’, a accomplished number. Having one row for ID fabricated up of integers is important as it allows us to grab a lot of rows afterwards alive what added abstracts they contain, as able-bodied as move through the abstracts sequentially. This accumulation will access incrementally on its own because we fabricated it the ‘PRIMARY KEY’, so it will go up by one with anniversary new entry. If you anticipate of your Excel spreadsheet, aloof brainstorm that the numbers bottomward the ancillary are your ID. You don’t accept to accommodate this cavalcade but it will accord you added adaptability with your data.

Text is a string. In added words, it lets you access words, symbols, and numbers— up to 65,535 characters. In added databases you adeptness see this accounting as ‘varchar(255)’. This agency the aforementioned thing, and the cardinal 255 in brackets is the breadth of the cord (we generally put 255 actuality as this is the longest cardinal of characters that can be counted with an 8-bit number). For now let’s stick with ‘text’.

As you get added advanced, there are affluence added options, like the adeptness to actualize a new table application rows from an old table.

Now you’ve got a database with an abandoned table alleged ‘clients’. The abutting affair you’ll apparently appetite to do is to put some abstracts in there! To do this we use INSERT INTO. Here, you’ll admit into your specific table and afresh you’ll account the columns in brackets, followed by the values.

You’ll be able to admit advice into some columns and not others.  We can additionally admit assorted rows of abstracts application aloof a distinct statement, by application lots of brackets afar by commas.

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For example, if we capital to amend our audience table, afresh we would do article like this:

What’s happened here, is that all of the associates of the greatest bandage on Earth accept active up to our commitment account (A No-Prize to whoever can name the bandage in the comments below).

Note that I’ve added new curve actuality in adjustment to accomplish this added readable. You can do the aforementioned aback application your own statements. The new bandage doesn’t denote a new account until the semi colon appears appropriate at the end.

Also agenda the use of the citation marks for our strings, abundant like Java.

DELETE is for deleting rows from tables. To use delete, the actual syntax is:

So, if we capital to annul a distinct record, we could use:

Roy Wood wasn’t in the bandage for actual long, so he doesn’t get to break on the list. We could additionally use this to annul anyone over a assertive age.

If you aloof use DELETE FROM table_name; afresh you’ll end up deleting the absolute capacity of the table. Be actual abiding afore you do that! If you appetite to annul the capacity of the table and it’s structure, afresh you’d use DROP TABLE. Be alike added accurate aback accomplishing that.

Adding and removing abstracts is aboveboard enough. Occasionally, you’ll aloof appetite to amend some information. Maybe you aloof charge to change the email abode but you don’t appetite to annul and reinsert the absolute record.

In that case, you can use UPDATE in the afterward manner:

You can additionally change annal application added fields, for example:

In this case, we’re afterlight the email column, alone for rows with the ID ‘3’ or the Email ‘Mik4Ever@aol.com’. (This is why it’s so accessible to accept that autoincrementing rowid!)

This aforementioned affection can be acclimated to change assorted rows at already (for archetype if we acclimated the action WHERE country). If you balloon to use WHERE afresh you’ll amend every distinct record… so be careful!

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Using these statements will body your database up nice and big. But that’s appealing abortive until you can additionally retrieve that advice back.

SELECT is acclimated to acknowledgment a set of after-effects from one or added tables. If we capital to retrieve someone’s name or a account of audience age-old 21, afresh we would use SELECT and chase this up with some specific capacity to ascertain absolutely the affectionate of abstracts we appetite to retrieve.

This would acquiesce us to baddest a accomplished agglomeration of altered columns from our specific table.

FROM is a article that changes the behavior of the SELECT statement. In this case, it defines which table we appetite use. FROM is a appropriate article in any SELECT statement. However others like WHERE are optional. WHERE allows us to clarify the rows that accept been retrieved by a ‘predicate’ – a accurate or apocryphal statement. Brainstorm my applicant acquaintance capacity table had addition cavalcade in it for ‘age’ and we capital to acquisition audience earlier than 21. In that case we would type:

The ‘>’ attribute is an abettor acceptation ‘greater than’. So we are alone selecting annal area the accumulation in the ‘age’ cavalcade is greater than 21.

To see how this adeptness assignment in practice, here’s a activity from Gary that puts SQLite into use in the ambience of an Android app:

Here we’re creating a new database (mydb) and afresh a new table alleged ‘mydata’ afterwards blockage if it exists and deleting it if so (DROP TABLE IF EXISTS). Afresh we’re inserting abstracts in two columns— one that names the abstracts ‘random’ and one that consists of a about generated integer. Finally, it’s displayed on the awning via a TextView alleged “myTextView”.

In an accessible post, we’ll analyze addition way to accomplish a agnate effect.

There are abounding added statements you’ll acceptable acquisition yourself application frequently. For example, ALTER can acquiesce you to add new columns. AS allows you to rename columns and tables. COUNT lets you calculation entries. HAVING is agnate to WHERE. GROUP BY lets you accumulation your results.

Of course, this is by no agency a absolute guide. There is a lot to apprentice here. You can alike use extensions in adjustment to accomplish circuitous statements like If, Then, and others (though best of this can additionally be done through Java if you’re application SQLite for architecture apps).

Eventually, you’ll charge to familiarise yourself with Cursors in adjustment to absolutely accomplish the best of SQL.

Eventually, you’ll charge to accustom yourself with Cursors in adjustment to absolutely accomplish the best of SQL. Cursors acquiesce us to move through rows of abstracts incrementally and afresh accomplish operations or tests on that data. For those with a coding background, it basically allows us to accomplish bend operations. This isn’t consistently necessary, as accoutrement like ‘WHERE’ acquiesce us to clarify the abstracts added easily. If you anytime end up application big abstracts for apparatus learning, you’ll appetite to accomplish some appealing custom accomplishments and that’s aback you’ll charge some beefier coding chops.

My advocacy is to focus on architecture your table, abacus data, and retrieving it. Aback you charge to do article added complex, cull up Google and do some reading.

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There will be addition column advancing actual anon to altercate the use of SQLite in Android application the SQLiteOpenHelper class, which will appearance you how to apparatus this in your cipher in a almost aboveboard manner. Until then, I additionally acclaim branch over to SQLFiddle.com which is a abundant apparatus for testing SQL statements in-browser.



 

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