if statement in select query

Insert is a common statement in T-SQL, insert into table (Field1,field2,...) VALUES (value1,value2,...) This form is essential in application development. But in our development, testing process, we often encounter situations that require table replication, such as copying part of a Table1 data to table2, or copying the entire table1 to table2, when we use SELECT INTO and INSERT into The

Insert is a common statement in T-SQL, insert into table (Field1,field2,...) VALUES (value1,value2,...) This form is essential in application development. But in our development, testing process, we often encounter situations that require table replication, such as copying part of a Table1 data to table2, or copying the entire table1 to table2, when we use SELECT INTO and INSERT into The

PL/SQL script language value assignment statement syntax table and record comply with the type usage, select the statement if else usage anonymous block (1), assign value statement syntax PL/SQL values use: = "=" some rules need to be observed in the comparison operator value assignment

SQL UNION operatorThe UNION operator is used to combine the result set of two or more SELECT statements.Note that the SELECT statement inside the UNION must have the same number of columns. The column must also have a similar data type. Also, the order of the columns in each SELECT

ThinkPHP -- SQL query statement, ThinkPHP -- SQL statement I. Query Method ThinkPHP provides three basic query methods: String condition query, Index Array condition query, and object b

-------Android Training, Java training, look forward to communicating with you! ----------1. Select the structure if statement format and its use　Format of the A:IF statement:if (comparison expression 1) {statement body 1;}else if (comparison expression 2) {Statement body 2;}else if (comparison expression 3) {

| +------+--------+------+------+------+-----------+--------------+ 1 row in Set (0.00 sec) mysql> Example: Querying employee and Department tables using an inner join and displaying query results in ascending order of the age field mysql> mysql> Select Num,name,employee.d_id,age,sex,d_name,function-From employee,department where employee.d_id=department.d_id , order by age ASC; +------+----

Select the structure if statement and switch statement. ------- Android training, java training, and hope to communicate with you! ---------- 1. Select the structure if statement format and Its Usage　 A: if statement format:If (c

Tags: compare except select merge style position SSI into resBrief introduction: Retrieves rows from the database and allows you to select one or more rows or columns from one or more tables in SQL Server 2012. Although the complete syntax of the SELECT statement is more complex, its main clauses can be summarized as f

When you join multiple tables, in a SELECT statement, if you use a using statement, the selected column in the using statement cannot be specified in the SELECT statement, otherwise it will be reported ORA-25154View the EMP tables

1. Select Structure StatementC # Selection Structure statement is mainlyif (judging condition) {1}else{2}Returns true when the condition in the if is satisfied execution 1, only if the condition in the if is not satisfied to return false execution 2For example:2. Looping statementsThe loop statement is mainly divided into: While

When you modify the batch beautifying select + statement that can be modified, several problems found in non-IE scenarios may be added one after another. 1. Mozilla and Opera do not support this font, And it is ineffective to change the DTD. Test inMozilla Firefox1.5 and Opera9.0 are displayed as Arial fonts. Special symbols are supported. For example: 6 Bytes You can open it in different browsers

As shown in the following: Reply content: As shown in the following: Affected refers to the number of rows that were changed, and the select query does not alter the contents of the row. Http://php.net/pdoIn PDO, the number of rows that are queried by the select query is obtained by using count to calcu

The stored procedure executes the select statement and the insert statement in the same table. The stored procedure executes the select statement and the insert statement in the same table.Public void onedb_twoconnect (){Using (tr