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sql是什么，通俗的说，太专业听不懂？ - 知乎 SQL是一种用于处理数据的语言，就像我们说的汉语、英语一样，有特定的语法结构，让我们灵活地处理数据。 SQL并不难学，首先得理解 S Q L 三个字母分别代表什么。 Structured Query Language，简写为SQL，意思是结构化查询语言。也就是说SQL是用来查询数据用的，通过代码指令来实现个性化的数据抽取
Should I use != or lt; gt; for not equal in T-SQL? - Stack Overflow Yes; Microsoft themselves recommend using <> over != specifically for ANSI compliance, e g in Microsoft Press training kit for 70-461 exam, "Querying Microsoft SQL Server", they say "As an example of when to choose the standard form, T-SQL supports two “not equal to” operators: <> and != The former is standard and the latter is not
sql - NOT IN vs NOT EXISTS - Stack Overflow Which of these queries is the faster? NOT EXISTS: SELECT ProductID, ProductName FROM Northwind Products p WHERE NOT EXISTS ( SELECT 1 FROM Northwind [Order Details] od WHERE p
How do I perform an IF. . . THEN in an SQL SELECT? The CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server SELECT CAST( CASE WHEN Obsolete = 'N' or InStock = 'Y' THEN 1 ELSE 0 END AS bit) as Saleable, * FROM Product You only need to use the CAST operator if you want the result as a Boolean value If you are happy with an int, this works: SELECT CASE WHEN Obsolete = 'N' or InStock = 'Y' THEN 1 ELSE 0 END
What is the use of the square brackets [] in sql statements? The Microsoft book for SQL course says "You should use two-part names to refer to tables in SQL Server databases, such as Sales Customer" so they don't ask to surround namespace with square bracket but if I remember correctly, surrounding them puts it in the right namepsace
sql - Find all tables containing column with specified name - Stack . . . 6 Hopefully this isn't a duplicate answer, but what I like to do is generate a sql statement within a sql statement that will allow me to search for the values I am looking for (not just the tables with those field names ( as it's usually necessary for me to then delete any info related to the id of the column name I am looking for):
What is the purpose of using WHERE 1=1 in SQL statements? It's also a common practice when people are building the sql query programmatically, it's just easier to start with 'where 1=1 ' and then appending ' and customer id=:custId' depending if a customer id is provided
What is the difference between INNER JOIN and OUTER JOIN? (SQL Standard 2006 SQL Foundation 7 7 Syntax Rules 1, General Rules 1 b, 3 c d, 5 b ) So don't outer join on until you know what underlying inner join on is involved Find out what rows inner join on returns: CROSS JOIN vs INNER JOIN in SQL That also explains why Venn (-like) diagrams are not helpful for inner vs outer join