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Tags: postgresql10 partition_table foreign_partition_table1. Create a master tableCREATE TABLE Part_tab (c1 int, c2 int,name varchar) PARTITION by RANGE (C1);2. Create sub-partition tableCREATE TABLE part1 PARTITION of Part_tab for VALUES from (0) to (100);CREATE TABLE part2 PARTITION of Part_tab for VALUES from (+) to (200);3. Attach a table that already exists as a sub-partition of the primary table1). Attach partition (additional table partition)--
BLOCK:sql> alter system dump DATAFILE 4 block 20;System altered.Look for the newly created dump file in your Udump directory.--Dump multiple blocksUse the following syntax to dump multiple blocks:ALTER SYSTEM dump datafile 1.2 Analyzing data Block dumpsFrom the above block dump:Block_row_dump:tab 0, row 0, @0x1d49tl:38 FB:--h-fl--lb:0x0 Cc:8Col 0: [3] C2 4a 46Col 1: [5] 4d 49 54 48Col 2: [5] 4c 4bCol 3: [3] C2
-test function // \ Param N1 parameter 1 // \ Param C2 parameter 2 // \ return description bool text (INT N1, ctext C2 ); Method 2: //// Brief description of the \ brief function-Detailed description of the test function //// function. Here, the detailed description of the function can be written, which can be a line break ///, as shown here, at the same time, you must note that there must be a blank line b
Oracle functions are divided into basic functions and analysis functions, The basic functions are the most commonly used, It is rumored that it is often used in data warehouses, In this blog post, we will only introduce the most common basic Oracle functions. According to the following route, Character Functions Numeric Functions Date Functions Conversion functions Group functions Start with the character function. 1. ASCII (c) C is a string parameter. The functi
MemSQL, SQLFire, Oracle XE performance comparison test, memsqlsqlfire 1. Software Version Memory SQL 3.1 Pivotal SQLFire 1.1.2 Oracle 11g XE 2. Test Environment Host OS: Windows 7 64-bit Professional Edition CPU: i7-3770 3.4 GHz Memory: 16 GB Hard Disk: larger than 800 GB Vmwarevm OS: CentOS 6.3 64-bit Memory: 16 GB MemSQL runs on virtual machines, and SQLFire and Oracle directly run on host machines. SQLFire only enables one server member 3. DDL MemSQL DROP TABLE t_main;DROP TABLE t_rel1;DRO
This is a creation in Article, where the information may have evolved or changed. One requirement is to allow the use of pipe characters such as LS | wc-l when calling external commands with the Go language program the Go language has a certain encapsulation of calls to external commands, and here's a try: package mainimport ("os""os/exec")func main() {run1()}func run1() {cmd := exec.Command("ls", "|", "wc", "-l")cmd.Stdout = os.Stdoutcmd.Stderr = os.Stderrcmd.Start()cmd.Run()cmd.Wait()}
The Timeunit class is a class in the concurrent package, and the main method is to implement time conversions, such as converting days to times, or converting from time to hours.An enumeration type is defined in the class: The code is: nanoseconds { Public LongTonanos (LongD) {returnD;} Public LongTomicros (LongD) {returnD/(c1/C0); } Public LongTomillis (LongD) {returnD/(c2/C0); } Public LongToseconds (LongD) {returnD/(c3/C0); }
[] args) throws Clonenotsupport edexception {Shadowclone C1 = new Shadowclone (); Assign a value to C1 C1.seta (100) ; C1.SETB ("Clone1"); C1.SETC (New int[]{1000}); System.out.println ("Pre-clone: C1.a=" +c1.geta ()); System.out.println ("Pre-clone: C1.b=" +c1.getb ()); System.out.println ("Pre-clone: C1.c[0]=" +c1.getc () [0]); System.out.println ("-----------"); Clones the object
bonuses, if a row is a null value, the result will be null, as in the following example: Update Empset salary= (Salary+bonus) *1.1 In this statement, the employee's wages and bonuses will be updated to a new value, but if there is no bonus, i.e. salary + NULL, then the wrong conclusion will be drawn, and the NVL function should be used to exclude the effect of the null value. So the correct statement is: Update Empset salary= (SALARY+NVL (bonus,0) *1.1 Single line string function Single-line
11.23334. You can simply add up the salary and bonus. If a row is null, the result will be null. For example:3536 update emp37 set salary = (salary + bonus) * 1.13839 in this statement, the employee's salary and bonus will be updated to a new value, but if there is no bonus, that is, salary + null, then the wrong conclusion will be drawn, in this case, the nvl function is used to exclude the impact of null values.40. The correct statement is:4142 update emp43 set salary = (salary + nvl (bonus,
ascii (''a') big_a, ascii (''z'') big_z from empbig_a big_z65 122Chr ( I is a number. The function returns the characters in decimal format. Select chr (65), chr (122), chr (223) from empchr65 chr122 chr223a z BConcat (,) C1 and c2 are strings. The function connects c2 to the end of c1. If c1 is null, c2. if
and bonus. If a row is null, the result will be null. For example:Update empset salary = (salary + bonus) * 1.1In this statement, both the employee's salary and bonus will be updated to a new value, but if there is no bonus, that is, salary + null, the wrong conclusion will be drawn, in this case, the nvl function is used to exclude the impact of null values.The correct statement is:Update empset salary = (salary + nvl (bonus, 0) * 1.1Single-line string functionsA single-line string function is
Optimize hundreds of millions of data queries in 10 minutes and query hundreds of millions of data records A user developed QQ to contact me a few days ago, as shown below: Free dolphins. 16:12:01 Island Lord, I cannot find the result of one of my SQL statements. Can you check it for me? Orchid island master 16:12:10 How long will it take? Free dolphin 16:12:17 No results are returned for a long time. Orchid island master 16:12:26 Haha, good. Orchid island master 16:12:39 Send SQL statements an
method is called loose index scan. Which of the following conditions can I use loose index scan: 1. Single Table query In 2 Group by, only the leftmost prefix Column exists, and no other columns exist. 3 only supports max and min aggregation, and the column to be aggregated must be the index of the column in group. 4. The other part of the index that is not referenced by group by must be a constant) 5. prefix indexes are not supported. Assume that the table t1 (c1,
can call non-class objects .. for example, call an object A + 1 .. note that even if it is defined as a friend function, its operands must have a custom type. View an instance: # Include Using namespace STD;Class complex // plural class declaration{Public: // external interfaceComplex (double r = 0.0, double I = 0.0){Real = R;Imag = I;} // ConstructorComplex operator + (complex C2); // + reload as a member functionComplex operator-(complex
After the end of the final examination, the director asked the class teacher to calculate the score of the class and report it to the teaching office as soon as possible. The process includes entering the scores of each subject → calculating the total score, average score and ranking → counting the number of people, passing rate, excellent rate and overall index of each subject, printing various statistical reports → making statistical analysis charts of each subject, etc. With Excel, we don't n
returns the characters in decimal format.Select CHR (65), CHR (122), CHR (223) FROM empCHR65 CHR122 CHR223A z B CONCAT (,)C1 and c2 are strings. The function connects c2 to the end of c1. If c1 is null, c2. if c2 is null, c1 is returned. If c1 and c2 are both null, returns
Instead of simply adding up the salary and bonuses, if a row is a null value, the result will be null, as in the following example: Update Empset salary= (Salary+bonus) *1.1 In this statement, the employee's wages and bonuses will be updated to a new value, but if there is no bonus, i.e. salary + NULL, then the wrong conclusion will be drawn, and the NVL function should be used to exclude the effect of the null value. So the correct statement is: Update Empset salary= (SALARY+NVL (bonus,0) *1
result will be null, as in the following example: Update emp Set salary= (Salary+bonus) *1.1 In this statement, the employee's wages and bonuses will be updated to a new value, but if there is no bonus, i.e. salary + NULL, then the wrong conclusion will be drawn, and the NVL function should be used to exclude the effect of the null value. So the correct statement is: Update emp Set salary= (SALARY+NVL (bonus,0) *1.1 Single line string function Single-line string functions are used to manip
TopicSuppose a table has a federated index (C1,C2,C3,C4)--only the C1,C2,C3 portion of the federated index can be usedA where C1=x and C2=x and C4>x and C3=xB where C1=x and C2=x and c4=x order by C3C where C1=x and c4= x GROUP by C3,C2D where c1=x and c5=x order by C2,C3E w
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