What does where mean in vf?

Macro substitution, which indicates the content in quotation marks, such as x="123"If you use x+100, you will get an error because you can't add the character type to the numeric type, and if you use &x+100, the result will be 223, and & will take out the 123 in x quotation marks as numeric data.

1. Represents modulo operation (that is, taking remainder), such as 16%3=12, represents a string of characters, which is used in SQL statements, such as.

selefrom

Student. where

Name. like

Liu%"Indicates that the student whose surname is Liu is queried.

interrogative adverb] in which bai; Where to go; From**; On which side.

relational adverb] in which dao; Go there.

Conjunctive adverbs] in. within the place; Arrive. Where did you go?

Where have you been?

this is the house where i was born.

I was born in this house.

that is where we are going.

That's where we go.

that is just where you are wrong.

That's where you're wrong.

This is used in the sql command to filter records, which means to filter out the empty level.

Generic bai

Definition of generic du: Generic is.

A feature of a programming language. Allows programmer DAOs to write experience generics in strongly typed programming language to define some mutable parts that must be specified before they can be used. Various programming languages and their compilers and runtime environments have different support for generics.

A data type that parameterizes types to achieve reuse and improve the efficiency of software development. Generic classes are reference types, heap objects, and the concept of type arguments is mainly introduced.

Use where in SQL statements and for in VF statements, which is a fixed format phrase. The above update is the SQL statement.

Your question is misplaced, and I am looking forward to the best computer person in the foreign language world to answer it.

If your table is directly open and you want to display the results in the working window, you should usually use for instead of where

When using SQL statements, the basic structure is: sele-from-where, sele followed by the content of the search, from followed by the table name, followed by where is the condition satisfied.

Locate for is the first record in the work window that satisfies the conditions that follow the for.

Sele can query records that meet the conditions, and you can query multiple tables, and the table can be queried without opening the table.

seek finds the corresponding first record from the currently open table.

not is to negate the judgment result, not in is to negate the result of the judgment whether it is included, and not in is more specific.

It's similar to the question just now.

not exists is to scan the data in the subquery for each entry of the external edge master query to see if there is no data that satisfies the conditions.

in is a subquery that gives the result to the main query to match again (none).

The loop condition satisfies the loop, but does not satisfy the exit

where is the condition, .f.It means that it is logically false, and in this case it means if it is false.