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@tech-aki

SQL 本をさら読み

More than 1 year has passed since last update.

SQLとは

Structured Query Language

つまり、問い合わせ(DBへ)の言語な

SQLの種類

  • DDL

箱を作る(DB)

CREATE
ALERT
...
  • DML

操作する

SELECT
INSERT
...
  • DCL

制約を入れる

begin
commit
rollback 
...

基本構文

SELECT karamu
  FROM テーブル
  WHERE 条件
  • 比較演算子
= イコール
<> not
>= 以上とか ※右にイコール!!
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tech-aki

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Help us understand the problem. What is going on with this article?