英文字典,中文字典,查询,解释,review.php


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       


安装中文字典英文字典辞典工具!

安装中文字典英文字典辞典工具!










  • What does lt; gt; (angle brackets) mean in MS-SQL Server?
    <> operator means not equal to in MS SQL It compares two expressions (a comparison operator) When you compare nonnull expressions, the result is TRUE if the left operand is not equal to the right operand; otherwise, the result is FALSE If either or both operands are NULL, see the topic SET ANSI_NULLS (Transact-SQL) See here : Not Equal To
  • 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 server - What does += mean in T-SQL - Stack Overflow
    += (Addition Assignment) : Adds two numbers and sets a value to the result of the operation For example, if a variable @x equals 35, then @x += 2 takes the original value of @x, add 2 and sets @x to that new value (37)
  • What does double bars (||) mean in SQL? - Stack Overflow
    @Martin: I know, but the DBMS is relevant quite often; it's a good habit to get into SQL Server uses '+' as a string concatenation operator, for instance (Of course, the better solution would have been for the poster to simply run the query without the count() to see what it did in the first place instead of posting here ) –
  • sql - Oracle (+) Operator - Stack Overflow
    Oracle recommends that you use the FROM clause OUTER JOIN syntax rather than the Oracle join operator Outer join queries that use the Oracle join operator (+) are subject to the following rules and restrictions, which do not apply to the FROM clause OUTER JOIN syntax:
  • stored procedures - What does lt; gt; ~ mean in SQL - Stack Overflow
    All SQL server versions after 2014 supports '~' operator, its bitwise not operator I use it mostly to invert value of some flags (bit columns) in my DB You can see more here
  • sql - Equals(=) vs. LIKE - Stack Overflow
    The equals (=) operator is a "comparison operator compares two values for equality " In other words, in an SQL statement, it won't return true unless both sides of the equation are equal For example: SELECT * FROM Store WHERE Quantity = 200;


















中文字典-英文字典  2005-2009